A new determination of the Half-Life of 165/66 Dy
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Abstract
Inconsistencies in the measurements of dysprosium contents of rocks by instrumental neutron activation analysis (INAA) motivated us to determine the decay constant (λ) for 165Dy. Our measurements give a half-life of 152 ± 4 min. for this radioisotope, as compared to 139 min. from earlier determinations.
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References
BRUNFELT, A. O. and E. STEINNES, 1966. Instrumental neutron-activation analysis of "standard rocks". Geochim. Cosmochim. Acta., 30 : 921-928. DOI: https://doi.org/10.1016/0016-7037(66)90027-5
BRUNFELT, A. O. and E. STEINNES, 1969. Instrumental activation analysis of silicate rocks with epithermal neutrons. Anal Chim. Acta, 48 : 13-24. DOI: https://doi.org/10.1016/S0003-2670(01)85237-5
CONDIE, K. C., 1976a. Plate tectonics and crustal evolution, Pergamon Press, N. Y., 288p.
CONDIE, K. C., 1976b. Trace-element geochemistry of Archaean greenstone belts. Earth Sci. Rev., 12 : 393-417. DOI: https://doi.org/10.1016/0012-8252(76)90012-X
GORDON, G. G., K. RANDLE, G. G. GOLES, I. B. CORLISS, M. H. BEESON and S. S. OXLEY, 1968. Instrumental activation analysis of standard rocks with high-resolution γ-ray detectors. Geochim. Cosmochim. Acta, 32 : 369-396. DOI: https://doi.org/10.1016/0016-7037(68)90074-4
HASKIN, L. A., F. A. FREY, R. A. SCHMITT and R.H. SMITH, 1966. Meteoritic, solar and terrestrial rare-earth distributions. Phys. Chem. Earth, 7 : 167-321 (Pergamon Press, Oxford). DOI: https://doi.org/10.1016/0079-1946(66)90004-8
HERMANN, A. G., 1970. Yttrium and Lanthanides in K. H. Wedepohl (Executive Ed.). Handbook of Geochemistry, Vol. II-4, Springer-Verlag, Berlin.
JEROME, D. Y., J. CI. PHILIPPOT and E. BRICHET, 1972. Determination of 29 elements in Luna 16 soil by non-destructive activation analysis. Earth Planet. Sci. Lett., 13 : 436-440. DOI: https://doi.org/10.1016/0012-821X(72)90121-5
MANGAL, S. K. and P. S. GILL, 1962. Thermal neutron activation cross-sections for isomer production. Nuc. Phys., 36 : 542-548. DOI: https://doi.org/10.1016/0029-5582(62)90480-7
PAL, S., 1972. Reconnaissance geochemistry of some rocks of the Guanajuato Mineral, District, Mexico. Geofísica Internacional, 12 : 163-199. DOI: https://doi.org/10.22201/igeof.00167169p.1972.12.3.979
PERSSON, L., R. HARDELL and S. NILSSON, 1963. The decay of the ground state of Dy165. Arki Fysik, 23 : 1-34.
SHER., R., H. J. KOUTS and K. W. DOWNES, 1952. Half-life of 139-min. Dy165. Phys. Rev., 87 : 523-524. DOI: https://doi.org/10.1103/PhysRev.87.523.2
TERRELL, D. J. and S. PAL, 1977. Procedimientos generales del análisis instrumental por activación con neutrones aplicado a rocas y minerales. Anales del Instituto de Geofísica, 22/23 : 9-23.