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ICRP tissue weighting factors

Thus, the present Recommendations update the radiation and tissue weighting factors in the quantities equivalent and effective dose and update the radiation For radiological protection purposes, the absorbed dose is averaged over an organ or tissue, T, and this absorbed dose average is weighted for the radiation quality in

Table G-2 summarizes the revised organ/tissue weighting factors in ICRP-60 and provides risk factors for additional organs. Table G-2. Organ/Tissue The most recent, overall recommendations of International Commission on Radiological Protection (ICRP) 103 (2007) include a tissue weighting factor of 0.12 for The tissue weighting factor for the breast increased dramatically between 1991 and 2007 •1991: 0.05, 2007: 0.12 - Arguably the most important change in the entire Issue ICRP 26 ICRP 60 ICRP 103 Part 20 Tissue Weighting Factors, wT Gonads 0.25 0.20 0.08 0.25 Breast 0.15 0.05 0.12 0.15 Red bone marrow 0.12 0.12 0.12 0.1

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The most striking feature of the forthcoming ICRP recommendations appears to be the updating of the radiation and tissue weighting factors. For X and gamma ray Tissue Weighting Factors. The tissue weighting factor, w T, is the factor by which the equivalent dose in a tissue or organ T is weighted to represent the Currently, the ICRP's definition of equivalent dose represents an average dose over an organ or tissue, and radiation weighting factors are used instead of ICRP tissue weighting factors in Publication 60 versus those in Publication 103. One major difference between the ICRP publication 60 and 103 is that the tissue

What tissue weighting factors should be applied to

Tissue Weighting Factors. The tissue weighting factor, w T, is the factor by which the equivalent dose in a tissue or organ T is weighted to represent Tissue-weighting factors have again been changed and extended to a wider range of organs: The following table (from Tables B1 and B2, page 261, ICRP 103) from ICRP Publication 139, 2018. A factor by which the equivalent dose in a tissue or organ T is weighted to represent the relative contribution of that tissue or organ to the total health detriment resulting from uniform irradiation of the body. It is weighted such that [math]\sum\limits_T w_T = 1[/math] from ICRP Publication 133, 2016. The factor by which the equivalent dose to an organ or. Recently, the ICRP has proposed revisions to tissue weighting factors of the effective dose in its efforts to update its 1990 general radiological protection recommendations 1. The draft revision alters the tissue weighting factors for gonads and breasts to 0.08 and 0.12 from 0.20 and 0.05, respectively Table 1: Tissue weighting factors according to ICRP 103 (ICRP 2007) Table 2: Measured effective doses for various security scanners. Table 3: Modelled organ equivalent doses from backscatter scanners. Figure 1: A modern backscatter unit showing a passenger being screened

New ICRP recommendations - PubMe

Revised radiation and tissue weighting factors . 5. Revised dose limits remove non- stochastic organ dose limit . Changes in Nomenclature •Quality factor renamed radiation weighting factor, w R •Dose equivalent renamed equivalent dose = absorbed dose x radiation weighting factor . and summed over all radiations: H T = Σ R w R D T,R •Effective dose equivalent Tissue weighting factors, wT, in new ICRP the human body. They are calculated for reference recommendations. adults, children of different ages and the fetus at different stages of development. They do not take Organ/Tissue Number wT Total account of individual characteristics. Radiation contribution weighting factors are chosen as a simple represen- tation of the different effectiveness of. wT: tissue weighting factor for T (values recommended in ICRP 60) wR: radiation weighting factor for radiation R (also recommended in ICRP 60) DT,R: absorbed dose of radiation R averaged over T. We call the above wR E calculated using wR the effective dose using radiation weighting factor to distinguish from EQ−L, defined later

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- Radiation weighting factors from ICRP 60 (ICRP 103)(ICRP 103) - stochastic effectsstochastic effects tissue weighting factors Revised dose gg coefficients, ALI (ICRP (ICRP 60),(61) Revised lung model and Revised dose metabolic models (ICRP 66, 67) coefficients (ICRP 68) Age dependent dose coefficients for ingestion (ICRP 56 67 69) and Summary, ICRP 72 (ICRP 56, 67, 69) and inhalation. To determine the effective dose, the radiation and tissue weighting factors of ICRP Publication 103 (2007) were used. The conversion coefficients for the exposure of the Reference Male and the Reference Female are compared with the respective conversion coefficients from ICRP Publication 74 (1996) and ICRU Report 57 (1998), which are based on the properties of mathematical anthropomorphic. Factors that enable patient CT doses to be adjusted to account for ICRP 103 tissue weighting factors are provided, which result in E/DLP factors that were increased in head and chest CT, reduced in pelvis CT, and showed no marked change in neck and abdomen CT. Volume 38, Issue 3. March 2011. Pages 1261-1265. Related ; Information; Close Figure Viewer. Return to Figure. Previous Figure Next. Initial plan to review tissue reactions. ICRP Task Group 63 formed. Initial discussions at MC meeting. Extensive discussions at MC meeting. Statement issued. Publication 118 . Report in development. Active drafting of the statement. Consultation on report. Report approved Haematopoietic and immune systems Digestive system Reproductive system Skin Cardiovascular and cerebrovascular system Eye. In changing from ICRP 60 to ICRP 103 tissue-weighting factors, effective dose estimates were least affected for liver (0.6 mSv, 4% increase) and abdomen and pelvis (-1 mSv, 7% decrease) examinations. For CT of the head, effective dose decreased by 0.5 mSv, or 39%, because the weighting of the brain was reduced in ICRP 103 to 0.01, compared with that for ICRP 60, where half of the remainder.

weighting factors, and the effective dose is calculated by summing the equivalent doses to organs multiplied by the tissue weighting factors. The current publication provides information on the methodology of calculating SAFs, as well as the results for the adult male and adult female reference phantoms 4.1 Radiation weighting factors 14 4.2 Tissue weighting factors 16 4.3 Calculation of effective dose 17 4.4 Doses from external exposures 19 4.5 Doses from internal exposures 20 4.6 Collective dose 22 5 ICRP System of Protection 25 5.1 Categories of exposure 25 5.2 Types of exposure situation 26 5.3 Definition of a source 27 5.4 Principles of protection 28 5.5 Dose limits, constraints and. There is no physical, medical, or epidemiological explanation of new ICRP dose limits, radiation weighting factors, and tissue weighting factors. The changes are political and it was time to issue.

Tissue weighting factors Tissue Tissue Weighting Factor, WT Gonads 0.20 Red bone marrow 0.12 Colon 0.12 Lung 0.12 Stomach 0.12 Bladder 0.05 Breast 0.05 Liver 0.05 Esophagus 0.05 Thyroid 0.05 Skin 0.01 Bone surfaces 0.01 Remainder 0.05 (ICRU 60, 1991; NCRP 116, 1993 In particular, the tissue weighting factor for breast has increased while that for gonads has decreased. There are some presentational changes to the system of protection. While ICRP has maintained the three fundamental principles—justification, optimisation of protection, and dose limitation—it has attempted to develop a more holistic approach to radiological protection covering all. • ICRP 92: radiation-weighted dose • For X-ray, the weighting factor W R is 1. • SI unit is Sievert (Sv). • Conventional unit is rem. 1 Sv = 100 rem or 1 rem = 10 mSv. 5 Radiation Quantity and Unit • Effective Dose (E): = T E W T W R D T • Concerns different tissue radiosensitivity • Tissue weighting factors were established • Assigned the proportion of the risk of stochastic.

Tissue weighting factor - ICRPaedi

Based on the study carried out by Korea Institute of Nuclear Safety (KINS) so far, the following points are identified as major areas that need further in-depth review and consideration for the implementation of the ICRP 2007 recommendations into Korean radiation protection laws and regulations; changes in the radiation risk factors, radiation weighting factors and tissue weighting factors. Tissue weighting factors (w T) express the contribution of individual organs and tissues to overall detriment from cancer and hereditary effects, relating to whole body radiation exposure. Table 1 shows the values to be introduced in the new ICRP recommendations ( 7 ) In 2007 ICRP published a new set of radiation weighting factors (ICRP Publ. 103: The 2007 Recommendations of the International Commission on Radiological Protection). These factors are given below. Source: ICRP, 2007. Publ. 103: The 2007 Recommendations of the International Commission on Radiological Protection. As shown in the table, a w R of 1 is for all low-LET radiations, i.e. X-rays and.

Therefore, the ICRP lowered the tissue weighting factor for the gonads from 0.2 in the 1990 Recommendations to 0.08 in the 2007 Recommendations. In this way, the factors used in the calculation of effective doses are updated to accommodate new findings. Included in this reference material on March 31, 2013 Updated on March 31, 2015. Created Date: 1/15/2019 7:49:37 PM. ICRP is in the process of revising its 1990 recommendations on the effective dose where new values of organs and tissue weighting factors have been proposed and published in draft form for consultation by the radiological protection community. In its 5 June 2006 draft recommendations, new organs and tissues have been introduced in the effective dose which do not exist within the 1987 Oak Ridge. Tissue weighting factors (ICRP See 'International Commission on Radiological Protection'.Publ. 60, EU BSS 1996) The numerical values indicated above are valid legal EU-regulations for calculation of the effective dose Measure of a radiation effect to be indicated more precisely....In 2007 ICRP See 'International Commission on Radiological Protection'. published a new set of tissue weighting. Table 1 Tissue weighting factors specified in ICRP Publ. 60 and 26 Tissue weighting factor Tissue or organ Publ. 60 Publ. 26 Gonads Bone marrow (red) Colon Lung Stomach Bladder Breast Liver Esophagus Thyroid Skin Bone surface Remainder Total 0.20 0.12 0.12 0.12 0.12 0.05 0.05 0.05 0.05 0.05 0.01 0.01 0.05 1.00 - ~~ 0.25 0.12 0.12 0.15 0.0 Factors that enable patient CT doses to be adjusted to account for ICRP 103 tissue weighting factors are provided, which result in E/DLP factors that were increased in head and chest CT, reduced.

The tissue weighting factors are needed because different organs have different levels of sensitivity to radiation, even if the equivalent dose is the same. Effective dose is expressed in sieverts (Sv), or, more frequently, millisieverts (mSv) which are 1/1000th of a sievert. This is the most frequently used dose in radiological protection. Unless you see mention of a specific organ, a dose. Compared with ICRP 60 the number of specified organs and tissues T has been increased and the tissue weighting factors have been changed taking into account the results of risk factor research during the last 15 y , and also there have been some conceptional changes, e.g. the higher weighting of cancer incidence compared with cancer mortality The tissue weighting factors summate to 1.0, so that if an entire body is radiated with uniformly penetrating external radiation, the effective dose for the entire body is equal to the equivalent dose for the entire body. Use of tissue weighting factor W T. The ICRP tissue weighting factors are given in the accompanying table, and the equations used to calculate from either absorbed dose or. In atomic physics... weighting factor See tissue weighting factor. WR in accordance with Euratom basic standards 1996. The numerical values indicated above are valid legal EU-regulations for calculating the equivalent dose Measure of a radiation effect to be indicated more precisely... in an organ or tissue. In 2007 ICRP See 'International Commission on Radiological Protection'. published a.

The tissue weighting factor (W T) is a relative measure of the risk of stochastic effects that might result from irradiation of that specific tissue. It accounts for the variable radiosensitivities of organs and tissues in the body to ionising radiation.. To calculate the effective dose, the individual organ equivalent dose values are multiplied by the respective tissue weighting factor and. Tissue-weighting factors, w. T. Biokinetic and Dosimetric Models. Intake by inhalation or ingestion 20 for αparticles 0.12 for lungs. ET. 1. ET. 2. BB Al bb Extrathoracic airways Bronchiolar Bronchial Alveolar interstitial. Human Respiratory Tract Model, Publication 66 (1994) Updated in Publication 30 (ICRP 2015) • Aerosol characteristics Unattached fraction Size distribution.

Lecture 7-RADIATION PROTECTION

2.3 Ingestion cases most affected by revision of tissue weighting factors (ICRP, 1991), based on biokinetic and dosimetric models of ICRP Publication 30. The cases listed are those for which the effective dose coefficients are changed by more than 40% when weighting factors of ICRP Publication 26 are replaced by those of ICRP Publication 60..... 7 3.1 Parameters of the TGLM for 1-µm particles. tissue weighting factors from ICRP publications 103 and the prior factors from ICRP publication 60. The results of the new calculations were compared with the effective dose values published by the ICRP, which were generated with the Medical Internal Radiation Dose (MIRD) adult phantom and the tissue weighting factors from ICRP publication 60. Results: For 79% of the radiopharmaceuticals, the. A radiation dose study utilizing the 2007 ICRP tissue weighting factors and a cardiac specific scan volume. Gosling O(1), Loader R, Venables P, Rowles N, Morgan-Hughes G, Roobottom C. Author information: (1)Plymouth Hospitals NHS Trust, Derriford Hospital, Plymouth, Devon, UK

Tissue weighting factors in ICRP Publication 103 [28

2.1 Use of tissue weighting factor W T; 3 By medical imaging type; 4 Health effects; 5 Regulatory nomenclature. 5.1 UK regulations; 5.2 US effective dose equivalent; 6 History; 7 Future use of Effective Dose; 8 See also; 9 References; 10 External links; Uses. According to the ICRP, the main uses of effective dose are the prospective dose assessment for planning and optimisation in radiological. If the deviations, however, are judged (say, by ICRP or anyone else in the debate) to be too large, it would be rather straightforward with Table 1, column 5 to find a suitable set (say, as yet, grouped in four w T classes) of tissue weighting factors, in the case one wants to choose a mortality-based weighting model instead of the detriment-based model. The most prominent deviations are for. New effective dose (ICRP Publication 60) incorporates revised tissue weighting factors - Gonads Red marrow Colon Lungs Stomach Bladder Breast Liver Esophagus Thyroid Skin Bone surfaces Remainder 0.20 0.12 0.12 0.12 0.12 0.05 0.05 0.05 0.05 0.05 0.01 0.01 0.05 Prescription for calculating contribution from remainder is different from. The ICRP 2007 standard values for relative effectiveness are given below. The higher radiation weighting factor for a type of radiation, the more damaging it is, and this is incorporated into the calculation to convert from gray to sievert units. The radiation weighting factor for neutrons has been revised over time and remains controversial. Radiation Energy W R (formerly Q) x-rays, gamma.

The ICRP human alimentary tract model has also been applied at the recalculations. The effective dose was calculated using the new tissue weighting factors from ICRP publications 103 and the prior factors from ICRP publication 60. The results of the new calculations were compared with the effective dose values published by the ICRP, which were. Tissue weighting factor and its clinical relevance* - Volume 13 Issue 1. Skip to main content Accessibility help We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings. Login Alert . Cancel. Log in. ×. ×. Home. tissues with respect to the endpoints, such as cancer induction and mortality. Twelve tissues and organs are specified in ICRP report 60 (see Table 1) with individual weights w T, and an additional 'remainder' tissue is defined. A revised set of tissue weighting factors is proposed in the ICRP 2006 Draft Recommendations (see Table 2) Increasing the x-ray tube voltage from 80 to 140 kV increases the E/DLP conversion factor for cardiac CT by 17%. For the same incident radiation at 120 kV, doses in 45 kg adults were approximately 22% higher than those in 70 kg adults, whereas doses in 120 kg adults were approximately 28% lower. Accurate estimates of the patient effective dose in cardiac CT should use ICRP 103 tissue weighting.

Comparative Dosimetry for 68 Ga-DOTATATE: Impact of Using

  1. Erratum to: Effective dose to adult patients from 338 radiopharmaceuticals estimated using ICRP biokinetic data, ICRP/ICRU computational reference phantoms and ICRP 2007 tissue weighting factors . Gespeichert in: Erschienen: 2015 . Enthalten in: EJNMMI Physics - 2(2015), 1 vom: 30. Sept..
  2. tissue weighting factor: in radiation protection, a factor weighting the equivalent dose in a particular tissue or organ in terms of its relative contribution to the total deleterious effects resulting from uniform irradiation of the whole body. See: effective dose
  3. ICRP tissue weighting factors in Publication 60 versus those in Publication 103. One major difference between the ICRP publication 60 and 103 is that the tissue weighting factor for the remainder is now equally divided between 13 specified organs for males and females respectively . When calculating the effective dose according to the ICRP 60 system, the weighting factor for the remainder was.
  4. ations and dose calculations were based on data provided.
  5. Many translated example sentences containing tissue weighting factor - French-English dictionary and search engine for French translations
  6. Check 'tissue weighting factor' translations into German. Look through examples of tissue weighting factor translation in sentences, listen to pronunciation and learn grammar
  7. is the tissue weighting factor for tissue or organ T. der Gewebewichtungsfaktor für das Gewebe oder Organ T. @GlosbeMT_RnD. Algorithmisch generierte Übersetzungen anzeigen. Ähnliche Ausdrücke. gender-specific tissue weighting factor. geschlechtsspezifischer Gewebewichtungsfaktor; Beispiele Hinzufügen . Stamm. Übereinstimmung alle exakt jede Wörter . wT is the tissue weighting factor for.

Tissue weighting factor Radiology Reference Article

  1. Tissue Weighting Factors •Weighting factors equate the risk of cancer induction in the critical organ to the risk of cancer induction from uniform irradiation of the body •e.g., w T (lung) = 0.12 •100 rem to the lung gives same cancer risk as 12 rem to the whole bod
  2. Now for the tissue weighting factors, you will find some of this work described in Annex A of the draft recommendations. The highest tissue weighting factor had been previously assigned to the gonads. As a result of the review of the data, the gonad weighting factor has been reduced. We have tried to keep the numerical values of the tissue weighting factors as they were in Publication 60 and.
  3. ICRP Glossary. The ICRP Glossary collects ICRP's definitive explanations of terms for current use. Some entries include historical descriptions to help readers better understand the term in a particular context. It is a living document, updated regularly. Many ICRP publications feature their own glossaries including, for example, highly.

Effective dose (radiation) - Wikipedi

weighting factors 1, w R (ICRP, 2007) Radiation type. Radiation weighting factor, w: R: Photons : 1 . Electrons and muons ; 1 . Protons and charged pions : 2. Alpha. particles, fission fragments, heavy ions. 20 . Neutrons : See Figure (1) All values relate to the radiation incident on the body or, for internal sources, emitted. Quality Factor in dependence of LET (ICRP 60, 1991) RBE versus LET. GuestEditorial A CURRENT VIEW ON RADIATION WEIGHTING FACTORS AND EFFECTIVE DOSE The International Commission on Radiological Protection (ICRP) develope The reason for introducing these and the new tissue weighting factor changes will be discussed. ,'£ )<•*'$. :' ~,\'' * ' '^ •.••*- ' In many respects the 1990 recommendations of the International Commission on Radiological Protection (ICRP 1991) reflect the concepts given in their 1977 recommendations (ICRP 1977). The purpose of this discussion, however, is to examine the rationale.

CT effective dose per dose length product using ICRP 103

The tissue weighting factors of Publication 60 explicitly address tissue for which no dose coefficients were tabulated in Publication 53; for example, esophagus and a number of tissues comprising. named organs which have no specific weighting factor in Publication 60 (ICRP, 1991b). To avoid confusion, the expression 'Other organs and tissues' has been used in the tables of biokinctic data. 1.3. Colon (6) In Addendum 1 to Publication 53 (ICRP, 1991a), the lower large intestin

Evolution of dosimetric quantities of International

  1. Information about the tissue weighting factors w T and the radiation weighting factor w R of the corresponding component R of the radiation field is contained in the for which an isotropic radiation field is assumed. The conversion coefficients for the weighting factors according to the ICRP 60 recommendations were taken from the publication by Pelliccioni (Pelliccioni 2000) and for the.
  2. istered Activity Result * Ad
  3. age- and sex-averaged tissue weighting factors, based on updated risk data and in-tended to apply as rounded values to a population of both sexes and all ages. Effec-tive dose is calculated for a Reference Person and not for an individual. (j) Effective dose is intended for use as a protection quantity. The main uses o

Tissue Weighting Factors nuclear-power

  1. also used both tissue weighting factors (wT), from ICRP Publications 60 and 103. (2) wR = Step Function (ICRP 60) INAC 2009, Rio de Janeiro, RJ, Brazil. 3. RESULTS AND DISCUSSION The calculated neutron fluence to effective dose conversion coefficients in units of pSv.cm2 for both AP and PA irradiation geometry are listed in Table 1. The Figure 2 shows the calculated results for neutron.
  2. and tissues were calculated using the biokinetic models and datapresentedinthe same Publication 53 (ICRP 1977). It is noted that the weighting factors were designed to b
  3. The ICRP has also updated its 'tissue weighting factors' for calculation of the quantity 'effective dose' (ICRP 2007); these new weighting factors are included in the code, but two older sets of weighting factors proposed by the ICRP (ICRP 1979, ICRP 1991) are also available for use in the code, again to facilitate comparisons. Standardized kinetic data for radiopharmaceuticals were taken from.
  4. The tissue weighting factors summate to 1.0, so that if an entire body is radiated with uniformly penetrating external radiation, the effective dose for the entire body is equal to the equivalent dose for the entire body. Use of tissue weighting factor W T. The ICRP tissue weighting factors are given in the accompanying table, and the equations used to calculate from either absorbed dose or.
  5. List of organs as defined in ICRP 103 (Ref. 2) with tissue weighting factors translated into tissue weighting factors for MOSFET spots associated with the organ.The three region locations i = 1, 2, and 3 of the spots within the phantom correspond, respectively, to MOSFET placements cranial-to-thorax, thorax, and caudal-to-thorax
ICRP tissue weighting factors from ICRP publications 60

Equivalent dose - Wikipedi

  1. ICRP has concluded that the dose limits have been set in such a dose range that women are also well protected. Therefore, the the Commission continues to present sex-averaged tissue weighting factors and numerical risk estimates in connection with the calculation of effective dose for prospective radiological protection. Only one dose limit (20 mSv per year, averaged over defined periods.
  2. In radiation protection, the effective dose is a dose quantity defined as the sum of the tissue-equivalent doses weighted by the ICRP organ (tissue) weighting factors, w T, which takes into account the varying sensitivity of different organs and tissues to radiation. Effective dose is given the symbol E.The SI unit of E is the sievert (Sv) or but rem (roentgen equivalent man) is still commonly.
  3. Radiation Weighting Factors - ICRP. For photon and electron radiation, the radiation weighting factor has the value 1 independently of the energy of the radiation and for alpha radiation the value 20. For neutron radiation, the value is energy-dependent and amounts to 5 to 20
  4. First, the new ICRP tissue-weighting factors add on average 36% to the calculated effective dose. Second, the scanning field for cardiac CT is noticeably different to standard chest CT scans; incorporating the lower chest and upper abdomen. This difference in scanning area has a marked effect on the calculation of effective dose. The results of the present study, which also include the ImPACT.
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Toggle between ICRP 60/68, ICRP26, or 10 CFR 835 tissue weighting factors and remainder tissue rules ; Enter user specified particle transport rates (in the respiratory tract) - or use ICRP defaults - and perform calculations for both Reference Worker light activity and heavy activit Tissue weighting factors Current 0.01 bone surface, skin 0.05 bladder, breast, liver, oesophagus, thyroid, remainder 0.12 bone marrow, colon, lung, stomach 0.2 gonads New 0.01 bone surface, skin, brain, salivary glands 0.04 bladder, liver, oesophagus, thyroid 0.08 gonads 0.12 bone marrow, colon, lung, stomach, breast, remainder. Sex-specific detriment Applying to ages from 0 - 85 at exposure. Effective dose coefficients were computed from organ dose coefficients using ICRP 60 tissue weighting factors. 2.2 CONTAMINATED AIR Dose coefficients were calculated for an individual standing in a semi-infinite volume of contamination in the air. In this scenario, the individual was assumed to be standing on soil and the air was assumed to extend infinitely high. The air was assumed to have a. No, So absorbed dose weighted over a specific tissue multiplied by radiation weighting factor, WR is equivalent Dose. April 15, 2008 Radiation Protection 4 ICRP-60 Quantities (contd.) H T , R = wR .DT , R Not all radiation has the same biological effect, even for the same amount of absorbed dose. Equivalent dose is measured in an international. (ICRP) has used radiation detriment, which is a multidimensional concept to quantify the overall harm to health from stoc hastic effects of low-level radiation exposure of different parts of the body. Each tissue-speci fic detriment is deter- mined from the nominal tissue-specificriskcoefficient, weighted by the severity of the disease in terms of lethality, impac t on quality of life and. In their most recent recommendations, the International Commission on Radiological Protection (ICRP) proposed the use of a set of updated tissue and radiation weighting factors for the calculation of the effective dose. This recommendation was adopted in the European Union by the directive 2013/59/EURATOM in 2013 and implemented in the corresponding radiation protection regulations in Germany.