| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Research Abstract |
Gamma cells using Si and CdTe semiconductors have beendeveloped, and the best energy conversion ratios from gamma ray to electricity successfully reach over 5%. The energy conversion ratios depended on the cell thickness and ambient temperature. These characteristics are attributed to the life time and diffusion length of the carriers (electron- hole pairs) generated during the gamma ray irradiation. Although the decrease of the conversion ratio by long term irradiation is not avoided, it is found that the conversion ratios could be recovered by means of the heat treatment of the cells.
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