Bonino, G. and Cini Castagnoli, G. and Taricco, C. and Bhandari, N. (1997) On the half-life of 44Ti by results in meteorites. Il nuovo cimento C, 20 C (6). pp. 955-960. ISSN 1826-9885
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Abstract
Measurements of the 44Ti half-life display a large spread ranging from 46.4 to 66.6 years. The activity of this radioisotope measured in eight meteorites (chondrites) fell in the time interval 1883-1992 and calculated at the time of fall by the different values of T1O2 shows that the shorter values are not reliable, if it is assumed that the average cosmic-ray intensity has remained the same during the past two centuries. The low activity of the cosmogenic isotope 44Ti has been determined by means of a selective Ge-NaI (Tl) g-spectrometer with a very low background (about 1 count per day in the g-peak at 1157 keV of 44Sc in equilibrium with its parent 44Ti). The high stability of this system allows long-lasting runs (A107 s ), in order to achieve the standard deviation of counting up to A10%. PACS 94.40.Vf – Cosmic-ray effects in meteorites and terrestrial matter.
| Item Type: | Article |
|---|---|
| Additional Information: | Paper presented at the VII Cosmic Physics National Conference, Rimini, October 26-28, 1994 |
| Uncontrolled Keywords: | Meteorites, micrometeorites; other topics in nuclear decay and radioactivity; X- and g-ray instruments and techniques; conference proceedings |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia > 551.3 Processi superficiali ed esogeni e loro agenti (Classificare qui la Sedimentologia come studio dei processi superficiali) (Classificare le opere d'insieme sulla Sedimentologia in 552.5) > 551.39 Azione geologica di altri agenti (Include i cambiamenti di temperatura) > 551.397 Meteoriti (Classificare qui i crateri da meteorite) |
| Depositing User: | Marina Spanti |
| Date Deposited: | 09 Feb 2018 14:05 |
| Last Modified: | 09 Feb 2018 14:05 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/12408 |
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