Improvement of radiation response characteristic on CdTe detectors using fast neutron irradiation

The treatment of fast neutron pre-irradiation was applied to a CdTe radiation detector in order to improve radiation response characteristic. Electron transport property of the detector was changed by the irradiation effect to suppress pulse amplitude fluctuation in risetime. Spectroscopic performance of the pre-irradiated detector was compared with the original. Additionally, the pre-irradiated detector was employed with a detection system using electrical signal processing of risetime discrimination (RTD). Pulse height spectra of Am-241, Ba-133, and Cs-137 gamma rays were measured to examine the change of the detector performance. The experimental results indicated that response characteristic for high-energy photons was improved Ly the pre-irradiation. The combination of the pl e-irradiated detector and the RTD processing was found to provide further enhancement of the energy resolution. Application of fast neutron irradiation effect to the CdTe detector was demonstrated.