【摘要】 采用热丝辅助化学气相沉积(HFCVD)方法生长得到25μm厚的[100]取向金刚石膜,用以制备辐射探测器。在100 V偏压下,测得暗电流为16.1 nA,55Fe X射线(5.9 keV)和241Amα粒子(5.5 M eV)辐照下的净光电流分别为15.9nA和7.0nA。光电流随时间的变化先快速增加随后由于“pump ing”效应逐渐达到稳定。X射线和α粒子辐照下的平均电荷收集效率分别为45%和19%,并由Hecht理论计算得到对应的电荷收集距离为11.25μm和4.75μm。更多还原

【Abstract】 A radiation detector was fabricated by -oriented diamond film which was deposited by hot filament chemical vapor deposition（HFCVD） method.The thickness of the film was 25μm.Under a bias voltage of 100V,the dark current was 16.1nA.The net photocurrent was also obtained as 15.9 nA and 7.0 nA under the irradiation of ⁵⁵Fe（5.9 keV） X-ray and ²⁴¹Am（5.5 MeV） α particles,respectively.The photocurrent increased rapidly at first and reached stably for the "pumping" effect with the time elapsing.The charge collection efficiency was 45%（X-rays） and 19%（α particles）,corresponding to the charge collection distance of 11.25 μm and 4.75 μm by calculating according to Hecht theory.更多还原