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kong qi deng xiao fa ce hou yi
Author(s): 
Pages: 20-26
Year: 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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