Spontaneous Fission - Panasonic PT-DZ12000U Operating Instructions Manual

Spontaneous Fission Neutron and Gamma Yields
SF (years)
half-life
253
Es 6.7E5
252
Cf 85
249
Bk 6E8
244
Cm 1.38E7
242
Cm 7.2E6
241
Am 2E14
242
Pu 7E10
240
Pu 1.39E11
239
Pu 5.5E15
238
Pu 4.9E10
236
Pu 3.5E9
237
Np 1E18
238
U 7E15
235
U 1.9E17
234
U 2E16
232
U 8E13
232
Th 1E21
These neutron and gamma exposure rates are approximate
values for the spontaneous fission process. When you are
making exposure rate measurements you should take into
account shielding of the source (including self-shielding),
individual instrument response to both neutron and gamma
radiation, isotopic mixtures, age of the material (for both decay
and ingrowth), homogeneity of the material, and impurities.
Refer to the Specific Activity and Characteristic Radiations of
Commonly Encountered Radionuclides sections for information
on gamma exposure rates and radiations from primary decay
modes of these isotopes.
n/s/Ci n/s/GBq
7.14E3 1.92E2
2.64E9 7.14E7
1.25E2 3.38
1.11E5 3.0E3
5.28E3 1.43E2
0.18 4.86E-3
4.56E5 1.23E4
4.01E3 1.08E2
0.37 1.0E-2
1.52E2 4.1
69.7 1.88
0.18 4.86E-3
5.44E4 1.47E3
3.15E2 8.51
1.05 2.84E-2
0.07 1.89E-3
1.18 3.19E-2
167
mrem / hr
per Ci @ 30 cm
neutron gamma
0.1
2.93E4
<0.1
1.2
<0.1
<0.1
5.0
<0.1
<0.1
<0.1
<0.1
<0.1
0.6
<0.1
<0.1
<0.1
<0.1
0.1
1E4
<0.1
0.4
0.1
<0.1
2.0
0.1
<0.1
<0.1
<0.1
<0.1
0.2
<0.1
<0.1
<0.1
<0.1