核技术（英文版）
覈技術（英文版）
핵기술（영문판）
NUCLEAR SCIENCE AND TECHNIQUES
2015年
4期
040403-1-040403-4
,共1页
曹靖%肖睿%陈楠%曹宏睿%阴泽杰
曹靖%肖睿%陳楠%曹宏睿%陰澤傑
조정%초예%진남%조굉예%음택걸
X-ray spectra%Dragon-I%Spectral reconstruction%Transmission measurements%Geant4
The Dragon-I linear induction accelerator (LIA) at China Academy of Engineering Physics generates 20 MeV flash X-rays mainly for radiography applications in fluid dynamics. Its spectral information is quite important for diagnostic X-ray imaging applications, but because of its short pulse and great radiation intensity, direct measurement is impossible. In this work, we propose a new method based on transmission measurements to obtain the flash X-ray spectrum. Pure iron cylinders were used as attenuation material, and alanine dosimeters were attached on their rear bottom to record the dose after different degrees of attenuation. Iterative least square method was used to unfold the spectrum, while Geant4 Monte Carlo code was used to simulate the X-ray spectrum. The unfolded spectrum and the simulated spectrum have a high degree of consistency, with the reduced chi-square value of 0.044. This shows that the method is reliable in estimating megavoltage high-intensity X-ray spectrum.
