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Table 2

Fission rates R for fission chambers with different depositions. A and B are the measurement positions close to the source and in the reflector, respectively (see Fig. 1).

Material R (fiss/s) in A R (fiss/s) in B
U-235 (7.15 ± 0.20) × 105 (3.19 ± 0.63) × 105
U-238 (2.51 ± 0.03) × 104 (2.37 ± 0.25) × 101
Np-237 (6.80 ± 0.08) × 105 (1.47 ± 0.12) × 105
Pu-239 (9.09 ± 0.10) × 105 (2.45 ± 0.12) × 105
Pu-241 (2.01 ± 0.21) × 105 (1.62 ± 0.42) × 103
Am-241 (1.60 ± 0.11) × 105 (1.01 ± 0.07) × 103

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