THE HALF-LIFE OF $sup 181$Hf

Journal Article · Thu Sep 01 04:00:00 EDT 1960 · J. Inorg. & Nuclear Chem.

DOI:https://doi.org/10.1016/0022-1902(60)80034-6· OSTI ID:4154591

Lindner, M; Marsh, K V; Miskel, J A; Nagle, R J

The half life of Hf/sup 181/ has been reported as approximately 45 days. These determinations were made following the decay of thermal-neutron-irradiated hafnium by gross counting of both beta and gamma radiation. Since the formation of 70 day Hf/sup 175/ under these conditions is Lomparable to that of Hf/sup 181/, an attempt was made to minimize the effect of Hf/sup 175/ by production methods and to discriminate counting techniques. Counting efficiencies for the proportional counter and the scintillation counter were comparable for Hf/sup 181 and varied/ approximately lO% for Hf/sup 175/ with the scintillation counter giving the higher efficiency. Since the slightly longer half life obtained by scintillation courting is consistent with approximately 3% Hf/sup 175/ and since the proportional counter is insensitive to this contaminant, it is felt that the correct half life for Hf/sup 181/ng is 42.45 plus or minus O.O8 days. (B.O.G.)

• Research Organization: Univ. of California, Livermore
• NSA Number: NSA-15-002177
• OSTI ID: 4154591
• Journal Information: J. Inorg. & Nuclear Chem., Journal Name: J. Inorg. & Nuclear Chem. Vol. Vol: 15
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ACTIVATION
BETA DETECTION
GAMMA DETECTION
HAFNIUM 175
HAFNIUM 181
HALF-LIFE
NEUTRONS
PHYSICS
PROPORTIONAL COUNTERS
RADIOISOTOPES
SCINTILLATION COUNTERS