| Budget Amount *help |
¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
Fiscal Year 2022: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2021: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
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| Outline of Final Research Achievements |
A portable alpha-ray spectrum survey meter was developed and improved. A 2000 mm^2 ion-implanted silicon with an aluminum honeycomb structure was adopted for the detector. As a result, the full width at half maximum (FWHM) was 123 keV and the full width at tenth maximum (FWTM) was 247 keV for electrodeposited Am-241 source, so it is possible to identify the 800 keV difference in alpha -ray energy between Ac-225 and Ra-226. In addition, it was suggested that the tailing effect of alpha-rays emitted from Ac-225 and progenies could be suppressed by adding a collimator, and Ra-226 mixed with Ac-225 could be detected. This measuring instrument is highly effective for use in the field of alpha-nuclide production and simplifies the identification method of alpha-nuclides.
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