Appendix CRF - Part 3 - Northamptonshire County Council

Radiological Assessment 0820-2
Version 2
Radionuclide
Pathways associated
with water contaminated
by leachate
Drinking
water
Specific dose
(μSv y -1 per MBq)
Fish Crops
Pathways associated with soil
contaminated by irrigation with
contaminated water
Livestock and
associated
products
Am-241 1.76E-08 1.45E-09 3.88E-07 2.08E-12 1.67E-13
Cm-243 1.32E-08 1.09E-09 2.91E-07 3.59E-12 1.25E-13
Cm-244 1.07E-08 8.76E-10 2.34E-07 2.90E-12 1.01E-13
Table 5.5 Specific doses via exposure pathways associated with spillage of
leachate into a surface water resource. Results do not include the
effects of ingrowth of long-lived daughter radionuclides.
Sensitivity studies to show the effect of different assumptions about the exposed
individual are presented in Appendix C, where specific doses for an adult, an infant (1
year old) and child (10 year old) are given for the different potential exposure
pathways following a leachate spill to a surface water body. A comparison of the
calculated specific doses for different age groups shows that for pathways associated
with the consumption of fish and crops the greater consumption rates for adults
outweigh the higher dose coefficients for infants and children. For the pathways
associated with livestock and drinking water, the age group with the highest specific
dose depends on the radionuclide, but in all cases the ratio of specific doses between
age groups is less than a factor of 10. Only in the case of exposure through the
consumption of contaminated soil are specific doses to infants and children higher
than those to adults by a factor of more than 10, because of the greater consumption
rates assumed for these age groups.
5.4.3 Aerosol pathway
Specific doses calculated for workers and members of the public via the aerosol
pathway are presented in Table 5.6. These calculations are based on the assumptions
described in Section 4.1.8 and in Appendix A, and are presented as specific doses per
hour of exposure to aerosols.
Radionuclide
Specific dose
(μSv y -1 per MBq per
hour)
Workers Public
Radionuclide
Galson Sciences Limited 51 14 July 2009
Soil
Specific dose
(μSv y -1 per MBq per
hour)
Workers Public
H-3 2.51E-12 2.09E-12 Ra-226 1.88E-07 1.57E-07
C-14 5.6E-11 4.66E-11 Ac-227 5.49E-06 4.57E-06
Cl-36 7.04E-11 5.87E-11 Th-229 2.47E-06 2.06E-06
Fe-55 7.43E-12 6.19E-12 Th-230 9.65E-07 8.04E-07
Co-60 2.99E-10 2.49E-10 Th-232 1.64E-06 1.36E-06
WS010001/ENRMF/CONSAPPCRF 601