Occupational Intakes of Radionuclides Part 1 - ICRP

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DRAFT REPORT FOR CONSULTATION
Bone marrow. See also ‘Active (bone) marrow’; ‘Inactive (bone) marrow’.
Bone marrow is a soft, highly cellular tissue that occupies the cylindrical
cavities of long bones and the cavities defined by the bone trabeculae of the
axial and appendicular skeleton. Total bone marrow consists of a sponge-like,
reticular, connective tissue framework called stroma, myeloid (blood-cellforming)
tissue, fat cells (adipocytes), small accumulations of lymphatic
tissue, and numerous blood vessels and sinusoids. There are two types of bone
marrow, red (active) and yellow (inactive).
Committed Effective Dose (E(50)). See also ‘Effective Dose’.
In this report series: effective dose calculated with the use of committed
equivalent doses.
E(
50)
Male
Female
H ( r
T , 50)
H(
rT
, 50)
wT
2
T
Committed Equivalent Dose (H (rT50)). See also ‘Equivalent Dose’.
In this report series: Equivalent dose calculated using a 50-year commitment
period. It is the time integral of the equivalent dose rate in a tissue or organ rT
of the Reference Adult Male or the Reference Adult Female that is predicted
by the reference biokinetic and dosimetric models following intake of
radioactive material into the body of the Reference Worker. The integration
period is 50 years following the intake.
50
( r , 50)
H
( r , t)
dt
H T
T
0
For both sexes the equivalent dose rate H ( rT
, t)
in target tissue rT at time t
after an acute intake is expressed as
H ( r , t)
A(
r , t)
S ( r r )
T
r
S
S
w
T
S
where:
A(rS,t) is the activity of the radionuclide in source region rS at time t
after intake, Bq, predicted by the reference biokinetic models for Reference
Worker,
Sw(rS←rT) is the radiation-weighted S value (Bolch et al, 2009); i.e. the
equivalent dose in target tissue rT per nuclear transformation in source region
rS, Sv (Bq s) -1 , for the Reference Adult Male and Reference Adult Female.
Derived Air Concentration (DAC)
The DAC is the activity concentration in air in Bq/m 3 of the radionuclide
considered which would lead to an intake of an ALI assuming a breathing rate
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