THE SPECIFIC ACTIVITY AND HALF-LIFE OF Np$sup 23$$sup 7$
The Np/sup 237/ specific activity has been determined to be 1562 sintering time 7 disintegrations per minute per microgram which corresponds to a half-life value of 2.14 sintering time 0.01 x 10/sup 6/ years. The previously reported value was 2.2 sintering time 0.1 x 10/sup 6/ years. The new value was obtained by the absolute alpha counting of known amounts of Np/sup 237/ using both low geometry proportional counting and 4 The effects of liquid scintillation counting. The samples of Np/sup 237/ counted were taken from a standard solution prepared from neptunium metal and checked by coulometric titration. The specific activity of Np/sup 237/ was determined by the absolute alpha counting of known amounts of Np/sup 237/ using both low geometry proportional counting and 4 The effects of liquid scintillation counting. The aliquots of Np/sup 237/ were taken from a standard solution prepared from neptunium metal and checked by controlled potential coulometric titration. The observed alpha disintegration rate was corrected for the contribution of the plutonium impurity as determined by alpha energy analysis. The neptunium used was analyzed isotopically to insure that isotopes other than Np/sup 237/ were present at a sufficiently low concentration to be neglected. The standardizations and other experimental details are discussed in the following sections. (auth)
- Research Organization:
- General Electric Co. Hanford Atomic Products Operation, Richland, Wash.
- DOE Contract Number:
- W-31-109-ENG-52
- NSA Number:
- NSA-13-012432
- OSTI ID:
- 4259552
- Report Number(s):
- HW-59642
- Country of Publication:
- United States
- Language:
- English
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