Occupational Intakes of Radionuclides Part 1 - ICRP

2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
(178)
DRAFT REPORT FOR CONSULTATION
Figure 13 Structure of the HAT model. The dashed boxes are included to show connections
between the HATM and the HRTM and systemic biokinetic models. fA gives net transfer to
blood and replaces the f1 value of the gastrointestinal tract model. In general, uptake of
radionuclides is assumed to occur from the small intestine.
Table 9. Default generic HAT model transfer coefficients (per day) for total diet for the
reference worker a,b
From To Transfer coefficient c (d -1 )
Oral cavity contents Oesophagus Fast 6480
Oral cavity contents Oesophagus slow 720
Oesophagus Fast Stomach contents 12343
Oesophagus Slow Stomach contents 2160
Stomach contents Small intestine contents 20.57
SI contents Right colon contents 6
RC contents Left colon contents 2
LC contents Rectosigmoid contents 2
RS contents Faeces 2
a
The transfer rates of ICRP Publication 100 for the adult male have been assumed
for the reference worker.
b
Other transfer coefficients not given here are assumed to be zero unless specified in
the relevant element section. In most cases uptake to blood from the alimentary tract is taken
to occur from the small intestine (SI) contents, without retention in SI wall. The
f ASI,
RC
corresponding transfer coefficient is , where λSI,RC is the transfer coefficient from SI
1
f
A
80