化学气相沉积金刚石薄膜探测器对α粒子的电荷收集效率

 实验测量了自行研制的三明治电极结构化学气相沉积(CVD)金刚石薄膜探测器在室温下对241Am, 243Am 与244Cm α粒子的能谱响应，得到了其α粒子响应电荷收集效率随偏压的变化关系；获得了不同偏压下其相对平均电荷收集效率及响应谱下降沿10%处的相对电荷收集效率。结果表明：所研制的CVD金刚石薄膜探测器性能稳定，对α粒子响应的电荷收集效率随偏压的增加而趋于饱和，对α粒子平均电荷收集效率达33.5%，谱下降沿10%处的电荷收集效率达57%。

Charge collection efficiency of chemical vapor deposition diamond film detector to alpha-particles

The energy spectrum of the developed sandwich chemical vapor deposition(CVD) diamond film detector to alpha-particles,has been measured by experiments at room temperature,for 241Am source with a characteristic energy of 5.485 MeV and 243Am and 244Cm source with characteristic energies of 5.275 MeV and 5.805 MeV respectively.The trend of the charge collection efficiency changing with biased voltage was obtained,and the mean efficiency under different biased voltages and that at 10% of the trailing edge of the spectrum were also calculated.Results show that the performance of the detector is steady,and the charge collection efficiency of the detector to alpha-particles increases with the biased voltage increasing and is saturated at a certain biased voltage.The saturated mean charge collection efficiency can be 33.5%,and can reach 57% when calculated at the 10% of the trailing edge.