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From Hp(10) to Hp: impact of implementing ICRU/ICRP report 95 personal dose quantity on CaSO4:Dy-based TLD dosemeters - a Monte Carlo study.

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Title: From Hp(10) to Hp: impact of implementing ICRU/ICRP report 95 personal dose quantity on CaSO4:Dy-based TLD dosemeters - a Monte Carlo study.
Authors: Yadav R; Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India., Bhattacharya M; Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India., Bakshi AK; Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.; Homi Bhabha National Institute, Mumbai, 400085, India., Sapra BK; Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.; Homi Bhabha National Institute, Mumbai, 400085, India.
Source: Radiation protection dosimetry [Radiat Prot Dosimetry] 2026 Aug 11; Vol. 202 (13), pp. 1043-1056.
Publication Type: Journal Article
Language: English
Journal Info: Publisher: Oxford University Press Country of Publication: England NLM ID: 8109958 Publication Model: Print Cited Medium: Internet ISSN: 1742-3406 (Electronic) Linking ISSN: 01448420 NLM ISO Abbreviation: Radiat Prot Dosimetry Subsets: MEDLINE
Imprint Name(s): Publication: 2004- : Oxford, UK : Oxford University Press
Original Publication: Ashford, Kent : Nuclear Technology Pub., c1981-
MeSH Terms: Thermoluminescent Dosimetry*/instrumentation , Thermoluminescent Dosimetry*/methods , Thermoluminescent Dosimetry*/standards , Radiation Protection*/standards , Radiation Protection*/methods , Radiation Protection*/instrumentation , Radiation Monitoring*/instrumentation , Radiation Monitoring*/methods , Radiation Monitoring*/standards , Calcium Sulfate*/chemistry , Calcium Sulfate*/analysis , Dysprosium*/chemistry , Dysprosium*/analysis , Occupational Exposure*/analysis, Monte Carlo Method ; Radiation Dosage ; Humans ; Algorithms ; Photons ; Computer Simulation ; Radiation Dosimeters ; Reproducibility of Results
Abstract: The International Commission on Radiation Units and Measurements (ICRU), in collaboration with the International Commission on Radiological Protection (ICRP), has introduced new operational quantities in ICRU Report 95. Among these, the personal dose Hp addresses the significant limitations of the currently used Hp (10), which can overestimate the effective dose by up to a factor of 5.5 at photon energies below 70 keV. These changes necessitate a re-estimation of dosemeter response to evaluate potential modifications in dose algorithms and detector design. In this study, the performance of CaSO4:Dy thermoluminescent dosemeter (TLD) badges was investigated for the new operational quantity Hp and compared with the existing Hp (10). The badge response was simulated over photon energy range 12.3-1250 keV using the Monte Carlo Simulation code FLUKA and benchmarked against experimental validation. To correct for energy-dependent overestimation at lower photon energies, a new dose evaluation algorithm for Hp was developed based on disc dose ratio (R12). The disc dose ratio (R12) refers to the ratio of absorbed doses measured in CaSO₄:Dy TL discs D1 and D2 positioned under different filtration conditions within the badge and serves as an energy-sensitive parameter for correcting the over-response of the dosemeter in terms of Hp. The proposed algorithm demonstrated strong compliance with IEC 62387:2020 performance criteria (acceptance range 0.71-1.67), with 95% of estimated Hp values lying within 0.9-1.3 of the delivered dose. These results confirm that CaSO4:Dy TLD badges, when combined with the improved algorithm, are fully compatible with the new operational quantities recommended in ICRU Report 95, ensuring reliable application in personnel dosimetry.
(© The Author(s) 2026. Published by Oxford University Press. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.)
Substance Nomenclature: WAT0DDB505 (Calcium Sulfate)
1D4N45714Q (Dysprosium)
Entry Date(s): Date Created: 20260430 Date Completed: 20260811 Latest Revision: 20260811
Update Code: 20260811
DOI: 10.1093/rpd/ncag042
PMID: 42059348
Database: MEDLINE
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  Data: From Hp(10) to Hp: impact of implementing ICRU/ICRP report 95 personal dose quantity on CaSO4:Dy-based TLD dosemeters - a Monte Carlo study.
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  Data: <searchLink fieldCode="AU" term="%22Yadav+R%22">Yadav R</searchLink>; Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.<br /><searchLink fieldCode="AU" term="%22Bhattacharya+M%22">Bhattacharya M</searchLink>; Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.<br /><searchLink fieldCode="AU" term="%22Bakshi+AK%22">Bakshi AK</searchLink>; Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.; Homi Bhabha National Institute, Mumbai, 400085, India.<br /><searchLink fieldCode="AU" term="%22Sapra+BK%22">Sapra BK</searchLink>; Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.; Homi Bhabha National Institute, Mumbai, 400085, India.
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  Data: <searchLink fieldCode="MM" term="%22Thermoluminescent+Dosimetry%22">Thermoluminescent Dosimetry*</searchLink>/<searchLink fieldCode="MM" term="%22Thermoluminescent+Dosimetry+instrumentation%22">instrumentation</searchLink> <br /><searchLink fieldCode="MM" term="%22Thermoluminescent+Dosimetry%22">Thermoluminescent Dosimetry*</searchLink>/<searchLink fieldCode="MM" term="%22Thermoluminescent+Dosimetry+methods%22">methods</searchLink> <br /><searchLink fieldCode="MM" term="%22Thermoluminescent+Dosimetry%22">Thermoluminescent Dosimetry*</searchLink>/<searchLink fieldCode="MM" term="%22Thermoluminescent+Dosimetry+standards%22">standards</searchLink> <br /><searchLink fieldCode="MM" term="%22Radiation+Protection%22">Radiation Protection*</searchLink>/<searchLink fieldCode="MM" term="%22Radiation+Protection+standards%22">standards</searchLink> <br /><searchLink fieldCode="MM" term="%22Radiation+Protection%22">Radiation Protection*</searchLink>/<searchLink fieldCode="MM" term="%22Radiation+Protection+methods%22">methods</searchLink> <br /><searchLink fieldCode="MM" term="%22Radiation+Protection%22">Radiation Protection*</searchLink>/<searchLink fieldCode="MM" term="%22Radiation+Protection+instrumentation%22">instrumentation</searchLink> <br /><searchLink fieldCode="MM" term="%22Radiation+Monitoring%22">Radiation Monitoring*</searchLink>/<searchLink fieldCode="MM" term="%22Radiation+Monitoring+instrumentation%22">instrumentation</searchLink> <br /><searchLink fieldCode="MM" term="%22Radiation+Monitoring%22">Radiation Monitoring*</searchLink>/<searchLink fieldCode="MM" term="%22Radiation+Monitoring+methods%22">methods</searchLink> <br /><searchLink fieldCode="MM" term="%22Radiation+Monitoring%22">Radiation Monitoring*</searchLink>/<searchLink fieldCode="MM" term="%22Radiation+Monitoring+standards%22">standards</searchLink> <br /><searchLink fieldCode="MM" term="%22Calcium+Sulfate%22">Calcium Sulfate*</searchLink>/<searchLink fieldCode="MM" term="%22Calcium+Sulfate+chemistry%22">chemistry</searchLink> <br /><searchLink fieldCode="MM" term="%22Calcium+Sulfate%22">Calcium Sulfate*</searchLink>/<searchLink fieldCode="MM" term="%22Calcium+Sulfate+analysis%22">analysis</searchLink> <br /><searchLink fieldCode="MM" term="%22Dysprosium%22">Dysprosium*</searchLink>/<searchLink fieldCode="MM" term="%22Dysprosium+chemistry%22">chemistry</searchLink> <br /><searchLink fieldCode="MM" term="%22Dysprosium%22">Dysprosium*</searchLink>/<searchLink fieldCode="MM" term="%22Dysprosium+analysis%22">analysis</searchLink> <br /><searchLink fieldCode="MM" term="%22Occupational+Exposure%22">Occupational Exposure*</searchLink>/<searchLink fieldCode="MM" term="%22Occupational+Exposure+analysis%22">analysis</searchLink><br /><searchLink fieldCode="MH" term="%22Monte+Carlo+Method%22">Monte Carlo Method</searchLink> ; <searchLink fieldCode="MH" term="%22Radiation+Dosage%22">Radiation Dosage</searchLink> ; <searchLink fieldCode="MH" term="%22Humans%22">Humans</searchLink> ; <searchLink fieldCode="MH" term="%22Algorithms%22">Algorithms</searchLink> ; <searchLink fieldCode="MH" term="%22Photons%22">Photons</searchLink> ; <searchLink fieldCode="MH" term="%22Computer+Simulation%22">Computer Simulation</searchLink> ; <searchLink fieldCode="MH" term="%22Radiation+Dosimeters%22">Radiation Dosimeters</searchLink> ; <searchLink fieldCode="MH" term="%22Reproducibility+of+Results%22">Reproducibility of Results</searchLink>
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  Data: The International Commission on Radiation Units and Measurements (ICRU), in collaboration with the International Commission on Radiological Protection (ICRP), has introduced new operational quantities in ICRU Report 95. Among these, the personal dose Hp addresses the significant limitations of the currently used Hp (10), which can overestimate the effective dose by up to a factor of 5.5 at photon energies below 70 keV. These changes necessitate a re-estimation of dosemeter response to evaluate potential modifications in dose algorithms and detector design. In this study, the performance of CaSO4:Dy thermoluminescent dosemeter (TLD) badges was investigated for the new operational quantity Hp and compared with the existing Hp (10). The badge response was simulated over photon energy range 12.3-1250 keV using the Monte Carlo Simulation code FLUKA and benchmarked against experimental validation. To correct for energy-dependent overestimation at lower photon energies, a new dose evaluation algorithm for Hp was developed based on disc dose ratio (R12). The disc dose ratio (R12) refers to the ratio of absorbed doses measured in CaSO₄:Dy TL discs D1 and D2 positioned under different filtration conditions within the badge and serves as an energy-sensitive parameter for correcting the over-response of the dosemeter in terms of Hp. The proposed algorithm demonstrated strong compliance with IEC 62387:2020 performance criteria (acceptance range 0.71-1.67), with 95% of estimated Hp values lying within 0.9-1.3 of the delivered dose. These results confirm that CaSO4:Dy TLD badges, when combined with the improved algorithm, are fully compatible with the new operational quantities recommended in ICRU Report 95, ensuring reliable application in personnel dosimetry.<br /> (© The Author(s) 2026. Published by Oxford University Press. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.)
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        Value: 10.1093/rpd/ncag042
    Languages:
      – Code: eng
        Text: English
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        StartPage: 1043
    Subjects:
      – SubjectFull: Monte Carlo Method
        Type: general
      – SubjectFull: Radiation Dosage
        Type: general
      – SubjectFull: Humans
        Type: general
      – SubjectFull: Algorithms
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    Titles:
      – TitleFull: From Hp(10) to Hp: impact of implementing ICRU/ICRP report 95 personal dose quantity on CaSO4:Dy-based TLD dosemeters - a Monte Carlo study.
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              Text: 2026 Aug 11
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