Security of Radioactive Sources in Radiation Facilities

TABLE I-2 : ACTIVITY CORRESPONDING TO A
DANGEROUS SOURCE (D VALUE) a FOR
SELECTED RADIONUCLIDES
S. No. Radionuclide D value S.No. Radionuclide D value
(TBq)
(TBq)
1. Am-241 6.E-02
2. Am-241/Be 6.E-02
3. Au-198 2.E-01
4. Cd-109 2.E+01
5. Cf-252 2.E-02
6. Cm-244 5.E-02
7. Co-57 7.E-01
8. Co-60 3.E-02
9. Cs-137 1.E-01
10. Fe-55 8.E+02
11. Gd-153 1.E+00
12. Ge-68 7.E-01
13. H-3 2.E+03
14. I-125 2.E-01
15. I-131 2.E-01
16. Ir-192 8.E-02
17. Kr-85 3.E+01
18. Mo-99 3.E-01
19. Ni-63 6.E+01
20. P-32 1.E+01
21. Pd-103 9.E+01
22. Pm-147 4.E+01
23. Po-210 6.E-02
24. Pu-238 6.E-02
25. Pu-239 b /Be 6.E-02
26. Ra-226 4.E-02
27. Ru-106 3.E-01
(Rh-106)
28. Se-75 2.E-01
29. Sr-90 (Y-90) 1.E+00
30. Sr-90 1.E+00
31. Tl-204 2.E+01
32. Tm-170 2.E+01
33. Tc-99m 7.E-01
34. Yb-169 3.E-01
a Since this Table does not show which dose criteria were used, these D values should not be
used in reverse to derive possible doses due to sources of known activity.
b Criticality and safeguards issues will need to be considered for large multiples of D.
On the basis of the above discussion, sources used in the various applications are
categorised as given in Table I-3 below:
33