1- The β −-decay formulae
The activated Ag-isotopes disintegrate by β −-decay. Write the
decay of both the Ag isotopes including all the final products and
half-lives. You find the half-lives, which also will be measured,
in Fig. 11.
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2.
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Toto 1010 Toin 32m Tip 2.80 im 541 106Cd. 1 10m 18m 4. 1h 35m0.97% 11540.66% 159 0.314.54% 12us 2 1m 3.3 14d Toen 11010 11110 113In 1141 "In 1151 n 6.2n 58120s 4.2 4.9h 15m 4.29 435 1.2 4.452.23 SOS 40m 1.3m 1.2h 7.711 1.7h sod 1.5h а Tord 108cd Tod 11000 111 112 113 114cd5cd 2.6E17y 6.5h 0.89% 1.3 12.49% 12.8424.13% 7.7E 28.73% 14y 450 15 110 Ag "Ag 112 Ag 114A Ag 1.2h 41d 24m 51.8 2.4n 48.16 255 7.50 3.1h 5.4h 4. 7.21 8.30 145 184 40s sod 1.1m 1.1m 1.5$ 104Pd 105 106d 109 Pd 110Pd "11Pd T12Pd113 Pd 11.14% 22.33% 27.33% 6.5E 26.46% 14h 11.72% 23m21h 1s 4.71 5.Sh 3005 h 103Rh 70RM TORTORA TO'Rh TOBRE TORTOR RhRh 18m. 106AB TAS 101 DE TOSAS 109 48 TISA TOPd 10pd Figure 11: Extract from chart of the nuclides around the stable Ag isotopes. 11 1000 100+ Cross-section I 10 1E-10 1E-9 1E-8 157 156 1E-5 15-4 0,001 001 0,1 1 10 Incident energy (MeV) Figure 12: Neutron scattering cross section for hydrogen.
The solid angle with respect to the source occupied by the plate is decreasing with the distance, see Fig. 13. To be able to compare the activation efficiency at the different positions, solid angle corrections have to be performed. Since the resulting values only can be used relative to each other, we can chose the solid angle factor for position 1 as unity. Fill in the first column (solid angle factor) in Tab. 2. Ω1 Ω2 123 Figure 13: The solid angle occupied by the Ag plate at different positions, resulting in S21 > 122 > 123.
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