Calculation and experimental verification of alpha spectra under different pressure

To calculate the alpha spectra under different pressure, a mathematical model is established by using a method based on the overlapping area of the window and the projection of the source on window and on the range-energy relationship (R propor to E sup 3 sup / sup 2 is an adequate approximation for most purposes). The alpha spectrum on theoretical ground can be considered to be the convolution of the ideal spectrum and the response or system-spread function. Calculation of alpha spectra under different pressure is based on Fast Fourier Transform, and the comparisons with experimental alpha spectra are done correspondingly. The comparisons show that the correlation coefficients range from 0.93 to 0.99 as pressure decreasing. Peak position, peak area, FWHM and energy calibration curves of the calculated alpha spectrum are well agreed with those of measured alpha spectrum