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- W2034136688 abstract "Abstract Feldspar samples, which were extracted by means of liquid density separation from sediments, often show a considerable amount of quartz. This quartz amount can lead to an underestimation of the internal 40 K dose rate, if not taken into account when determining the potassium concentration of the sample. This paper outlines how a more exact estimation of the 40 K dose rate is possible, by using a chemical analysis of the potassium, sodium and calcium concentration of the feldspar separate and a calculation of the potassium concentration of the pure feldspar fraction. In the second part a newly developed method for determining the internal 40 K dose rate is presented. By detailed investigations of the afterglow behaviour of numerous feldspar samples after an irradiation with a defined β- or γ-dose (in the text designated as radio-phosphorescence), we observed that the peak emission of the red (700–750 nm) radio-phosphorescence depends on the potassium concentration of the feldspars. Pure potassium feldspars show a red luminescence maximum at about 700 nm, however it shifts with decreasing K-concentration to 750 nm for albites and plagioclases. This effect makes it possible to determine the potassium concentration of the pure feldspar fraction by means of the radio-phosphorescence signal." @default.
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- W2034136688 date "1997-04-01" @default.
- W2034136688 modified "2023-09-26" @default.
- W2034136688 title "New methods for a better internal 40K dose rate determination" @default.
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- W2034136688 doi "https://doi.org/10.1016/s1350-4487(96)00153-9" @default.
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