Element | Decay | Energy/MeV | Absorption coefficient of plastic scintillator | The semi-absorptive thickness of a plastic scintillator/cm |
Sr-90 | β | 0.196 | 192.186 | 0.004 |
Sr-90 | β | 2.288 | 7.317 | 0.095 |
Cs-137 | β | 1.576 | 12.014 | 0.058 |
Cs-137 | β | 0.512 | 53.643 | 0.013 |
Cs-137 | β | 0.174 | 225.160 | 0.003 |
Cs-137 | β | 0.300 | 109.107 | 0.006 |
Cs-137 | β | 0.416 | 70.636 | 0.010 |
I-129 | β | 0.409 | 72.249 | 0.010 |
I-129 | β | 1.176 | 17.733 | 0.039 |
K-40 | β | 1.350 | 14.760 | 0.047 |
K-40 | β | 0.560 | 47.570 | 0.015 |