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Application of pulsed optically stimulated luminescence from surface soil to retrospective dosimetry

パルス光励起ルミネッセンス線量測定法の表土への適用

藤田 博喜

Fujita, Hiroki

パルス光励起ルミネッセンス(P-OSL)を線量測定法として表土に適用するため、この測定器を独自に開発し、その性能調査を行った。その後、表土から抽出した石英と鉱物標本からの長石を用いて、P-OSLの基礎実験を行った。この結果、石英はLED露光後50$$mu$$sでもP-OSLを観測できるが、長石では数$$mu$$sでP-OSLは減衰することがわかった。次に、先の石英と長石を混合し、これにX線を人工的に照射した後、P-OSL線量法の適用条件に関して調査した。この結果からは、LED点灯時間が4$$mu$$sで、LED消灯時間が400$$mu$$sの条件で照射した線量を再構築できることがわかった。

The purpose of this study tries to apply the P-OSL to Japanese surface soil as retrospective dosimetry with ease physical separation. In this study, P-OSL instrument was developed originally. Performance of the instrument was tested using natural quartz extracted from Japanese surface soil and feldspar in mineral specimens. It was found that the signal from the feldspar decayed for 2-3 $$mu$$s and the signal from the quartz was measured over 50 $$mu$$s after the switch-off of the LED. By using mixture of the quartz and feldspar, the P-OSL protocol was improved to determine irradiation dose. Dose recovery test was conducted and then was successful to reconstruct irradiated dose by the P-OSL protocol with the pulse on-time of 4 $$mu$$s and the pulse off-time of 400 $$mu$$s.

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パーセンタイル:88

分野:Chemistry, Physical

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