| Autor: |
Sonntag, Ch., Münnich, K. |
| Zdroj: |
Zeitschrift für Physik; 1966, Vol. 197 Issue 3, p300-308, 9p |
| Abstrakt: |
The spectrometer consists of a 4″×4″ NaJ-crystal with a double lead shield - the inner one being of selected lead - and a guard anticoincidence ring in between. The apparatus is situated in a cellar covered by 3 meters of soil. The total background above 0.03 MeV is 120 cpm, being extremely stable with an intrinsic r.m.s. variation below ±2 per mil. The crystal is surrounded by a sample container of volume 1.8 liters. An energy dependent gamma detection limit (2 σ) ranging between 0.3 and 0.8 dpm has been obtained. This corresponds to a maximum detectable halflife of 1.0 to 2.7× 10 years per mole of the radioactive nuclide in the sample container. In the case of vanadium-50 (isotopic abundance 0.25%) a lower limit of the half-life was found to be 9.0×10 and 6.9×10 years respectively for the two modes of decay V-EC-Ti-γ(1.58 MeV) - Ti and V-β-Cr- γ(0.78 MeV)-Cr. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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