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The dependence of laboratory beta dose rate on grain size was measured using a Risø TL-DA-15 reader with the latest model of source housing (Radiat. Meas. 27(2) (1997) 83). In comparisons of optically stimulated luminescence signals due to laboratory beta-irradiation to similar signals due to external gamma-irradiations, no dependence of laboratory dose rate was observed for sample grain sizes between...
Simultaneous photocurrent and luminescence measurements were carried out on a K-feldspar crystal. There was a small photocurrent with 2.41 eV (515 nm) photon excitation. The photocurrent was reduced to near background levels by preheating the sample for 16h at 120∘C, even though there was still a substantial luminescence intensity. There was no measurable photocurrent with 1.45 eV (850 nm) photon...
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