Title :
The temporal response and relative proton-to-gamma ratio of radiation detectors made from natural diamond
Author :
Wagner, R.S. ; Joseph, J.R. ; Hilko, R.A. ; Harper, R.W. ; Tinsley, J.R.
Author_Institution :
Los Alamos Nat. Lab., NM, USA
Abstract :
The temporal response, relative proton-to-gamma ratio, and relative sensitivity of photoconductive detectors made in identical physical geometries from natural Class IIa diamond and from neutron-irradiated GaAs were measured. The temporal response of the diamond detectors varied from 145 to 360 ps FWHM for a 30 ps, 16 MeV end-point bremsstrahlung pulse. This response compares to 103 ps FWHM for the GaAs detectors. Proton-to-gamma ratios for the diamond detectors were three times those of the GaAs detectors. The relative sensitivities of the diamond detectors, compared with those in the GaAs detectors, were 0.5 to 0.7. The leakage current of the diamond detectors was at least three orders of magnitude lower than those in the GaAs devices. The temporal response of neutron-irradiated diamond detector was 90 ps FWHM, a significant improvement in speed over natural diamond
Keywords :
diamond; gamma-ray detection and measurement; leakage currents; proton detection and measurement; semiconductor counters; 103 ps; 145 to 360 ps; 16 MeV; Class IIa diamond; GaAs; leakage current; natural diamond; neutron-irradiated GaAs; radiation detectors; relative proton-to-gamma ratio; sensitivities; temporal response; Conductivity; Gallium arsenide; Gamma ray detection; Gamma ray detectors; Indium phosphide; Laboratories; Protons; Radiation detectors; Semiconductor materials; Silicon radiation detectors;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301147
