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Challenges in the dose calculation from urine measurements in routine internal monitoring of 131I and other radionuclides.

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Title: Challenges in the dose calculation from urine measurements in routine internal monitoring of 131I and other radionuclides.
Authors: Meisenberg, Oliver1 (AUTHOR) omeisenberg@bfs.de, Mohsin, Ayesha2 (AUTHOR)
Source: Radiation & Environmental Biophysics. Aug2025, Vol. 64 Issue 3, p409-416. 8p.
Subject Terms: *Iodine isotopes, *Radiation dosimetry, *Scientific observation, *Excretion, *Radioisotopes, *Estimation theory, *Standards, Urine collection & preservation
Abstract: The measurement of 24-hour urine samples is one of the methods of routine monitoring of intakes of radionuclides. It is briefly mentioned in relevant documents by the International Commission on Radiological Protection that for 131I the strong decrease of the excretion within the first days after an intake makes the dose calculation from urine measurements unreliable when the time pattern of the intake is unknown. This can result in a major overestimation of the committed effective dose. For quantifying the influence of the time pattern of an intake on the dose, the results of the dose calculation for an acute intake at the midpoint of a monitoring interval (standard assumption) were compared with those for a chronic intake with varying daily activity. For 131I, aerosols type F, the standard assumption of an acute intake can lead to an overestimation of the calculated dose by a factor of 140 on average as compared to a chronic intake. Among other investigated radionuclides, the strongest overestimation was found for 14C, gas/vapour type F, when measured every 180 days (factor of 330), although this method complies with current criteria from the international standard ISO 20553. It is recommended that ISO 20553 is supplemented with a criterion that describes the reliability of a monitoring method under different time patterns of an intake additional to the existing criteria. This criterion should set an upper limit for the ratio of the dose calculations under the described assumptions. [ABSTRACT FROM AUTHOR]
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  Data: Challenges in the dose calculation from urine measurements in routine internal monitoring of <superscript>131</superscript>I and other radionuclides.
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  Data: <searchLink fieldCode="AR" term="%22Meisenberg%2C+Oliver%22">Meisenberg, Oliver</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> omeisenberg@bfs.de</i><br /><searchLink fieldCode="AR" term="%22Mohsin%2C+Ayesha%22">Mohsin, Ayesha</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Radiation+%26+Environmental+Biophysics%22">Radiation & Environmental Biophysics</searchLink>. Aug2025, Vol. 64 Issue 3, p409-416. 8p.
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  Data: *<searchLink fieldCode="DE" term="%22Iodine+isotopes%22">Iodine isotopes</searchLink><br />*<searchLink fieldCode="DE" term="%22Radiation+dosimetry%22">Radiation dosimetry</searchLink><br />*<searchLink fieldCode="DE" term="%22Scientific+observation%22">Scientific observation</searchLink><br />*<searchLink fieldCode="DE" term="%22Excretion%22">Excretion</searchLink><br />*<searchLink fieldCode="DE" term="%22Radioisotopes%22">Radioisotopes</searchLink><br />*<searchLink fieldCode="DE" term="%22Estimation+theory%22">Estimation theory</searchLink><br />*<searchLink fieldCode="DE" term="%22Standards%22">Standards</searchLink><br /><searchLink fieldCode="DE" term="%22Urine+collection+%26+preservation%22">Urine collection & preservation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The measurement of 24-hour urine samples is one of the methods of routine monitoring of intakes of radionuclides. It is briefly mentioned in relevant documents by the International Commission on Radiological Protection that for 131I the strong decrease of the excretion within the first days after an intake makes the dose calculation from urine measurements unreliable when the time pattern of the intake is unknown. This can result in a major overestimation of the committed effective dose. For quantifying the influence of the time pattern of an intake on the dose, the results of the dose calculation for an acute intake at the midpoint of a monitoring interval (standard assumption) were compared with those for a chronic intake with varying daily activity. For 131I, aerosols type F, the standard assumption of an acute intake can lead to an overestimation of the calculated dose by a factor of 140 on average as compared to a chronic intake. Among other investigated radionuclides, the strongest overestimation was found for 14C, gas/vapour type F, when measured every 180 days (factor of 330), although this method complies with current criteria from the international standard ISO 20553. It is recommended that ISO 20553 is supplemented with a criterion that describes the reliability of a monitoring method under different time patterns of an intake additional to the existing criteria. This criterion should set an upper limit for the ratio of the dose calculations under the described assumptions. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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        Value: 10.1007/s00411-025-01129-z
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 409
    Subjects:
      – SubjectFull: Iodine isotopes
        Type: general
      – SubjectFull: Radiation dosimetry
        Type: general
      – SubjectFull: Scientific observation
        Type: general
      – SubjectFull: Excretion
        Type: general
      – SubjectFull: Radioisotopes
        Type: general
      – SubjectFull: Estimation theory
        Type: general
      – SubjectFull: Standards
        Type: general
      – SubjectFull: Urine collection & preservation
        Type: general
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      – TitleFull: Challenges in the dose calculation from urine measurements in routine internal monitoring of 131I and other radionuclides.
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            NameFull: Meisenberg, Oliver
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            NameFull: Mohsin, Ayesha
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            – D: 01
              M: 08
              Text: Aug2025
              Type: published
              Y: 2025
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