A SEARCH FOR RADIOACTIVITY AMONG THE NATURALLY OCCURRING ISOBARIC PAIRS
Low-background techniques were used to search for radioactivity among the naturally occurring isobaric pairs Cd-113-- In-113, In-115-- Sn-115, Sb-123-- Te-123, and Re-187--Os-187. No activity was observed from Cd-113 which is found to have a minimum half-life of 1.3 x 10/sup 15/ years for emission of BETA rays with energy > 1.2 kev. A new value of 480 plus or minus 30 kev was obtained for the beta-disintegration energy of In-115 and the half life measured to be 5.1 plus or minus 0.4 x 10/sup 14/ years. The unstable member of the Sb--Te-123 pair is shown to be Te-123 which decays by K electron capture with a half life of 1.24 plus or minus 0.10 x 10/sup 13/ years. The decay of Re-187 is established by observation of the beta spectrum with maximum energy 1.2 plus or minus 0.10 kev. The half life is estimated to be of the order of 3 x 10/sup 10/years. (auth)
- Research Organization:
- Atomic Weapons Research Establishment, Aldermaston, Berks, Eng.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-16-021405
- OSTI ID:
- 4815682
- Journal Information:
- Phil. Mag., Journal Name: Phil. Mag. Vol. Vol: (8), 7
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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