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.