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New Measurement of the 81Kr Atmospheric Abundance

Published online by Cambridge University Press:  18 July 2016

V V Kuzminov  and
A A Pomansky
V V Kuzminov
Affiliation:
Institute for Nuclear Research of the USSR Academy of Sciences, Moscow, USSR
A A Pomansky
Affiliation:
Institute for Nuclear Research of the USSR Academy of Sciences, Moscow, USSR
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Abstract

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We have determined the 81Kr activity to be (0.067 ± 0.003) decay/min. 1 krypton. Using this activity in conjunction with our new measurement of the 80Kr(n/γ)81Kr reaction cross-section of (12 ± 4)b, we infer that the 81Kr activity is 1.5-2.0 times that which would be calculated using the current cosmic ray flux. This implies that the average cosmic ray intensity in the atmosphere during the 81Kr life-time was greater than the current intensity, a fact that has implications for the 14C time scale.

Type
Natural 14C Variations
Information
Radiocarbon , Volume 22 , Issue 2 , 1980 , pp. 311 - 317
Copyright
Copyright © The American Journal of Science 

References

Barabanov, I R, Gavrin, V N, Golubev, A A, and Pomansky, A A, 1973, An intensity of cosmic rays in the atmosphere during the last 105-106 years and 81Kr content: Izvestija Akad Nauk SSSR, ser Phys no. 6, p 1186–1188.Google Scholar
Barabanov, I R, Golubev, A A, and Pomansky, A A, 1974, Geomagnetic field and content of 81Kr in the atmosphere: Geomagnetizm i Aeronomija, v 14, p 924–926.Google Scholar
Barabanov, I R, and Pomansky, A A, 1977, Atmospheric abundance of 81Kr and cosmic ray intensity, in International conference on low-radioactivity measurements and application, The High Tatras, Czechoslovakia: Bratislava, Solvenskè Pedagogické Nakladatel'stvo, p 405–408.Google Scholar
Barabanov, I R, Pomansky, A A, and Rjasny, V G, 1972, A measurement of the cross-section of the reaction 80Kr(n,γ)81Kr: Pisma JETPh, p 643–646.Google Scholar
Galperin, M D, Kuzminov, V V, and Striganov, P A, 1979, Calculations of the efficiency of γ-quanta absorbtion in different materials: Preprint, INR.Google Scholar
Kovalchuk, E L, Kuzminov, V V, Pomansky, A A, and Zatsepin, G T, 1977, Deep underground laboratory for low-radioactivity measurements, in Internatl conf on low-radioactivity measurement and application, The High Tatras, Czechoslovakia: Bratislava, Slovenské Pedagogické Nakladatel'stvo, p 23–27.Google Scholar
Loosli, H H, and Öeschger, Hans, 1969, 37Ar, 30Ar and 81Kr in the atmosphere: Earth and Planetary Sci Letters, v 1, p 67–75.Google Scholar
MacNamara, J and Thode, H G, 1950, The relative neutron capture cross-sections of the isotopes of krypton and xenon: Physics Rev, v 80, p 296.Google Scholar
Öeschger, Hans, Houtermans, J, Loosli, H H, and Wahlen, M, 1970, A constancy of cosmic rays following from the study of different isotopes in meteorites and at the earth, in Olsson, I U, ed, Radiocarbon variations and absolute chronology, Nobel symposium, 12th, Proc: Stockholm, Almqvist & Wiksel, p 471–487.Google Scholar
Reynolds, J H, 1950, A new long-lived krypton activity: Physics Rev, v 79, p 886.Google Scholar
Storm, E and Israel, H, 1967, Photon cross-sections: Los Alamos Scientific Laboratory rept, June, 1967.Google Scholar