Appendix CRF - Part 3 - Northamptonshire County Council

Radiological Assessment 0820-2
Version 2
2.2 Wastes
The nuclear industry is generating significant quantities of radioactive waste from
decommissioning, and these types of waste will continue to arise as decommissioning
continues. Some of these wastes are potentially suitable for disposal at landfill sites.
Wastes from other activities and industries, such as hospitals, universities and
radiochemical manufacture, could also be considered for disposal at such sites.
To ensure that the potential radiological consequences of the disposal of a
representative range of LLW can be assessed, the radionuclides listed in Table 2.5
have been considered in the radiological assessment. Radionuclides with half-lives
less than one year have not been explicitly assessed. Where such radionuclides arise
from ingrowth, they are included through the assumption that they will be in secular
equilibrium with the parent radionuclide, and the dose coefficients used are adjusted
accordingly.
Radionuclide
Half-life
(years)
3 H 12.3
14 C 5,730
36 Cl 3.01E+05
55 Fe 2.73
60 Co 5.27
63 Ni 96.0
90 Sr 28.8
94 Nb 2.00E+04
99 Tc 2.11E+05
106 Ru 1.02
108m Ag 418
125 Sb 2.80
126 Sn 2.07E+05
129 I 1.57E+07
133 Ba 10.7
134 Cs 2.10
137 Cs 30.0
147 Pm 2.60
152 Eu 13.3
154 Eu 8.80
155 Eu 4.96
210 Pb 22.3
Daughters assumed to be in secular
equilibrium
90 Y
106 Rh
126 Sb
137m Ba
210 Bi, 210 Po
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