Abstract
The violet thermoluminescence (VTL)-retrospective dosimetry was developed and was then confirmed to be effectual method in emergency situation using quartz extracts from surface soil collected around tokai, Ibaraki, Japan. All of the measurements were undertaken by VTL measurement condition using modified single aliquot regenerative-dose protocol.An on-line automatic spectrometric system installed with a small spectrometer and a CCD camera unit was developed for weak and changeable TL-spectrum measurement with rising temperature for application to natural quartz. From spectrometry of the TL, two emission peaks, consisting of 400 nm and 620 nm, were revealed. In this paper, 400 nm were only investigated.The accumulated γ-doses of quartz extracts from surface soils which were 10 m from radiation source at gamma field at the Institution of Radiation Breeding (IRB), National Institute of Agrobiological Sciences (NIAS), were evaluated to be 0.8~0.9 Gy using VTL measurement, concordant with the value measured by the commercial pocket dosimeter. In addition, the dose of quartz extracted from surface soils set at 20 m was evaluated to be 0.2 Gy, agreeable to the value calculated from the pocket dosimeter’s value. Conclusively, the VTL-retrospective dosimetry was recommended for the quartz extracts from surface soils in the emergency situation.
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