Article ID Journal Published Year Pages File Type
10731723 Radiation Measurements 2005 5 Pages PDF
Abstract
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 ∼55 and 250μm. Below 40μm there is a clear dependence on grain size, with the dose rate to 4-11μm grains being ∼12% lower than that for 55-250μm grains. The strength of dependence on grain size is less than that observed by Wintle and Aitken (Int. J. Appl. Radiat. Isot. 28 (1977) 625) and this difference is attributed to source geometry (specifically the sample-to-source spacing). For fine grains (4-11μm), there appears to be little dependence on mounted sample mass, over the range 0.1-1.5 mg (sample evenly mounted on aluminium discs, 10 mm in diameter).
Related Topics
Physical Sciences and Engineering Physics and Astronomy Radiation
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