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- W2257121897 abstract "The exact value of the decay constant of K/sup 40/ is of great importance in the determination of the age of geological formations and for studying the natural radioactivity of biological specimens. A scintillating gel, proposed previously by one of the authors (D. G. Fleishman and L. G. Shakhidzhanyan, Atomnaya Energiya 6of 669(1959)) was used for measuring the specific activity of K. The absolute activity of the sample was determined by extrapolating the integral spectrum to zero energy level. The c.p. K/sub 2/SO/ sub 4/ used for the measurements was thoroughly mixed with the scintillating gel, and the spectrum of K/sup 40/ was determined by means of a photomultiplier and a 99-channel pulseheight analyzer. The self-absorption of the beta particles may be neglected if the dimensions of the crystals are kept below 70 to 80 microns; the error due to gamma radiation does not exceed 0.1% of the absolute value of the beta activity. The data indicate that the absolute activity per 1 g of natural K is equal to 1630 %PP 5 beta particles per minute, thus agreeing well with previously reported values. On the basis of the concentration of K/sup 40/ in the natural isotopic mixture, the betamore » -decay constant was found to be lambda beta = 4 67 plus or minus 0 05 x 10/sup -10/ year/sup -1/. (TTT)« less" @default.
- W2257121897 created "2016-06-24" @default.
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- W2257121897 date "1962-04-01" @default.
- W2257121897 modified "2023-09-24" @default.
- W2257121897 title "DETERMINATION OF THE /cap beta/-DECAY CONSTANT OF K$sup 4$$sup 0$" @default.
- W2257121897 hasPublicationYear "1962" @default.
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