| Abstrakt: |
A simple method is presented for the preparation of alpha sources to be analyzed by an alpha spectrometer equipped with a semi-conductor detector. The procedure consists of evaporating to dryness an aqueous solution of the alpha-emitter, redissolving the residue in situ with 0.1 Ν HNO3, precipitating with 3ΝNH4OH and drying. The residual NH4NO3is redissolved in 3 NNH4OH, dried again, and sublimed at a higher temperature. The deposit is washed with distilled water, after which the plate is dried and ignited at red heat. Dramatic improvement is illustrated with several alpha emitters of different chemical properties, including 208/209Po, 230Th, 231Pa, 232/234U, and 238/239Pu. |
