New isotopes Rn
نویسندگان
چکیده
A.N. Andreyev, S. Antalic, D. Ackermann, L. Bianco, D. Cullen, I. Darby, S. Franchoo, F. P. Heßberger, S. Hofmann, M. Huyse, B.Kindler, I. Kojouharov, A.-P. Leppänen, B. Lommel, R. Mann, G. Münzenberg, R.D. Page, J. Pakarinen, J. J. Ressler, S. Šaro, B. Streicher, B. Sulignano, J. Thomson, P. Van Duppen TRIUMF, Vancouver BC, V6T 2A3, Canada; Comenius University, Bratislava, Slovakia; GSI, Darmstadt, Germany; University of Liverpool, L69 7ZE, U.K.; Department of Physics and Astronomy, University of Manchester, M13 9PL, U.K.; IPN Orsay, F-91406 Orsay Cedex, France; 7 IKS, University of Leuven, Belgium; University of Jyväskylä, Jyväskylä, Finland; Dept. of Chemistry, Simon Fraser University, Burnaby BC V5A-1S6, Canada
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A radon-thoron isotope pair as a reliable earthquake precursor
Abnormal increases in radon ((222)Rn, half-life = 3.82 days) activity have occasionally been observed in underground environments before major earthquakes. However, (222)Rn alone could not be used to forecast earthquakes since it can also be increased due to diffusive inputs over its lifetime. Here, we show that a very short-lived isotope, thoron ((220)Rn, half-life = 55.6 s; mean life = 80 s),...
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[1] We used Rn and Ra measured in the Upper Gulf of Thailand to estimate Rn atmospheric evasion across the water-air interface. The Chao Phraya estuary represents a steady-state source of these tracers and we looked at their horizontal distribution on a transect leading away from the estuary into the Gulf. The isotopes Rn and Ra have very similar half-lives and are affected in the same manner b...
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heavy water plus neutral current additive to an activity level of one decay per day per tonne ofD^O (DDT) for the thorium chain and(5(TpDTs for the uranium chain. /O jL^ It is equally important to be able to monitor these activity levels, by some form of ^f radioactive assay. From the point of view of purification the critical isotopes are 2 y year ^Th in the thorium chain (see Fig. 1) and 1600...
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A new thoron reference ((220)Rn) in air measurement system is developed at the LNE-LNHB with the collaboration of the IRSN. This measurement system is based on a reference volume with an alpha detector which is able to directly measure thoron and its decay products at atmospheric pressure. In order to improve the spectrum quality of the thoron progenies, we have applied an electric field to cat...
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The radon isotopes (Rn-222 and Rn-220) and their progenies are responsible for more than 50% of natural radiation dose and the second leading factor in the case of the development of lung cancer after smoking [1]. Rn-222 (radon) and Rn-220 (thoron) are generated in crustal materials from their natural Ra-226 (U-238 decay series) and Ra-224 (Th-232 decay series) content, respectively. As a resul...
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Radon is a noble gas formed from the natural radioactive decay of uranium (U) and thorium (Th), natural components of the earth’s crust, which decay to radium (Ra) and then to radon (Rn). Decay chains include Ra and Rn for U; Ra and Rn for U; and Ra and Rn for Th. As radium decays, radon is formed and released into pores in the soil. Fissures and pores in the substrate allow the radon to migrat...
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