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kong qi deng xiao fa ce hou yi
Author(s): Zhu Jieqing Le Anquan
Pages: 20-
26
Year: 1981
Issue:
4
Journal: Nuclear Techniques
Keyword: 测厚仪; 质量阻止本领; 等效法; 半经验公式; 相对质量; 探测器; 质量厚度; 实验值; 精密度; 能量损失;
Abstract: An a-ray thickness gauge has been designed for the purpose of thickness measuring of ultra-thin foils (0-4mg/cm2) made of any material. The precision is better than 1.5%. By using air equivalent method, it is possible to measure samples in the air to simplify the instruments used and to obtain higher precision. A semi-empirical formula for the relative mass stopping power as a function of Ea, Z and A has been derived. The divergency between the results from the formula and the data from Ziegler's table is less than 8%.
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