| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1986: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1985: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1984: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Research Abstract |
The accurate value of the stopping power of matter is of interest in many fields of physics, such as nuclear physics, radiation dosimetry, surface analysis, ion implantation and the electronic surface of the atomic and so on.
Stopping powers of Au, Ta and Ag for protons from 3 to 22 MeV have been measured with a surface barrier silicon detector, The results have been presented in the form of Bichsel's X-variable. For Au the experimental X-value points fit very well with the theoretical X-value curve curve using the Bonderup shell correction for protons from 3 to 8 MeV (lower energy regions) and the mean excitation energy, I, of 745.4 eV, If we use Bichsel's shell correction, I value of 824 eV reproduces fairly well the experimental X-value points for the same proton energy regions. However, for protons from 8 to 22 MeV (higher energy regions), experimental X-value points dit not fit well with the each theoretical X-value curve using the Bonderup and Bichsel shell corrections. The former, theoretical curve locates in the upper site of experimental points and the latter locates in the under site of those. We desire more suitable theory of inner shell correction to advance.
For Ta and Ag. there were a systematic error between lower and higher energy regions because different accerelators were used. Though the origin is not found now, it will be solved and these experimental data will soon be analyzed.
Stopping powers of A-150 Tissue-Equivalent plastic have been measured with ancertainty of 0.5% form 2.5 to 7.5 MeV protons using a surface barrier silicon detector. The results are compared with the calculated values obtained by using Bragg's additivity rule. In the calculation we used stopping power table of Andersen-Ziegler. The experimental results agree with the calculation values within 0.6%.
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