Occupational Intakes of Radionuclides Part 1 - ICRP

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DRAFT REPORT FOR CONSULTATION
7.2 Dose coefficients
(405) For inhalation, dose coefficients are calculated using the revised HRTM
described in Section 3.2. Particle sizes are assumed to be log-normally distributed
with an AMAD of 5 μm and geometric standard deviation σg of approximately 2.5
(ICRP, 1994a, Paragraph 170) inhaled by a male Reference Worker at Light Work.
They are assumed to have a density of 3.00 g cm -3 , and a shape factor of 1.5 (ICRP,
1994a, Paragraph 181).
(406) For ingestion, dose coefficients are calculated using the HATM (ICRP, 2006)
with parameter values for the reference adult male, and are given for specified values
of fA.
(407) Extensive additional information for all relevant isotopes of each element is
given on an accompanying CD-ROM, including:
Committed equivalent dose coefficients for organs and tissues, for males and
females;
Dose coefficients for all chemical forms considered;
Dose coefficients for inhaled aerosols with median sizes ranging from an
AMTD of 0.001 µm to an AMAD of 20 µm;
Committed doses to 7 d, 30 d, 1 and 10 years after acute intake as well as 50
years. These data illustrate the build-up of dose with time;
Dose coefficients for intake by ingestion, with the default fA values appropriate
for the element, for all relevant radioisotopes;
Dose coefficients for radioisotopes not given in the printed reports in this
series.
7.3 Interpretation of Individual Monitoring Data
(408) The information provided in subsequent reports in this series on the
interpretation of bioassay monitoring data updates that given in Publications 54 and
78 (ICRP, 1988a, 1997b), and also includes data related to the calculation of doses
per unit content. These additional data are provided to facilitate the interpretation of
monitoring data.
(409) Methods of individual monitoring are given with typical detection limits that
can readily be achieved. Comments on preferred measurement techniques and the
adequacy of the detection limits are given where appropriate.
(410) Predicted values of the measured quantity (body content, organ content, or
daily excretion) are given as a function, m(t), at time t after an acute intake of 1 Bq.
(411) If only a single measurement is made, the intake, I, can be determined from
the measured quantity, M, by:
M
I (7.1)
m
t The intake can be multiplied by the dose coefficient, e(50), to give the committed
effective dose, E(50). Hence:
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