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Radiations from Y90 Zr97 Pr142, and Pr143

✍ Scribed by B.L. Saraf; J. Varma; C.E. Mandeville

Publisher: Elsevier Science
Year: 1954
Tongue: English
Weight: 145 KB
Volume: 258
Category: Article
ISSN: 0016-0032
DOI: 10.1016/0016-0032(54)90023-x

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✦ Synopsis

observations have been made over temperatures between 900" and 1300" C. The initial conductance is found to obey Ohm's law; its temperature dependence is of the usual exponential form with an activation energy of 1.1 volt. Optica1 absorption measurements show an absorption maximum at 4000 A.U. Assuming a simple semi-conductor model this is tentatively ascribed to a donor band at 3.1 volts below the conduction band. The above activation energy yields a value of 2.2 volts which, in view of the Franck-Condon principle, may correspond to the same donor band.

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Radiations from Zr97 and Nb97

✍ C.E. Mandeville; E. Shapiro; R.I. Mendenhall; E.R. Zucker; G.L. Conklin 📂 Article 📅 1952 🏛 Elsevier Science 🌐 English ⚖ 322 KB

Zr9602 (isotopic concentration 90 per cent) was irradiated by slow neutrons in the Oak Ridge pile. The half-period of the niobium daughter element, chemically separated from zirconium, was found to be 72.1 ~ 0.7 rain. and that of Zr 97 to be 17.0 + 0.2 hr. By aluminum absorption and Feather analysis