Oct 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971phrvc...4.1182h&link_type=abstract
Physical Review C, vol. 4, Issue 4, pp. 1182-1188
Other
16
Scientific paper
A value of 3.7 × 106 yr (+/- 10%) for the half-life of Mn53 was determined by a direct method involving measurement of both the specific activity [(dis/min Mn53)/(μg Mn)] and the isotope ratio (Mn53/Mn55). The Mn53 specific activities were determined by neutron activation, and the Mn55/Mn53 isotopic ratios by mass spectrometry. A surface-ionization method was applied using a rhenium single filament with the sample mounted in a silica-gel layer. This technique gave a stable and enhanced ion beam of Mn+. One source of Mn53 was an electroplated Cr target bombarded by 15-MeV α particles in a cyclotron. The other source of Mn53 was the Mn fractions extracted from iron meteorites by carrier-free processes. Activities of 10 dis/min Mn53 and 2000 dis/min Mn54 were obtained with about 2 μg of Mn55 from the Cr target. The isotopic ratio Mn55/Mn53 was 750. Activities of about 1 (dis/min Mn53)/(μg Mn) and isotopic ratios Mn55/Mn53 of 3000-4000 were obtained from the iron-meteorite extracts.
Honda Masatake
Imamura Mineo
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