Experimental study on vacuum level impacting features based on portable α spectrometer

For the influence of vacuum level on peak position,energy resolution and detection efficiency in α Spectrum analysis, the experimental study based on self-developed portable α spectrometer was carried out. Given other experimental conditions consistency, we tested 239Pu standard source on the impact of six kinds of vacuum level. The results show that, α spectrum peak channel and energy resolution have linear relationships with vacuum degree, both of them increase linearly with vacuum level, detection efficiency increases exponentially with it. Meanwhile, according to measured results,the characteristic equations were established respectively. The proposal is that, in working conditions permitting, we can increase vacuum level,improve the performance of α spectrometer. (authors)