The temporal response and relative proton-to-gamma ratio of radiation detectors made from natural diamond

Conference · Tue Dec 01 04:00:00 EST 1992

OSTI ID:10105869

Wagner, R S ^[1]; Hilko, R A; Harper, R W ^[2]; Tinsley, J R ^[3]

---

1. Los Alamos National Lab., NM (United States)
2. EG and G Energy Measurements, Inc., Los Alamos, NM (United States). Los Alamos Operations
3. EG and G Energy Measurements, Inc., Goleta, CA (United States). Santa Barbara Operations

Measurements have been made on photoconductive detectors made from natural Class Ila diamond and from neutron-irradiated GaAs using identical physical geometries. The temporal response, relative proton-to-gamma ratio, and relative sensitivity were measured. For comparison, the same measurements were made on similarly configured InP(Fe) detectors. The temporal response of the diamond detectors varied from 145 to 360 ps full width at half maximum (FWHM) for a 30 ps, 16 MeV end point bremsstrahlung pulse. This compares to 103 ps FWHM for the GaAs detectors. Proton-to-gamma ratios for the diamond detectors were > 3.5 times those of the reference GaAs detector. The ratio was 1.2 times the reference for InP(Fe) detectors. The relative sensitivities of the diamond detectors, compared with the GaAs detectors, was 0.5 to 0.7. The leakage current of the diamond detectors was at least three orders of magnitude lower than the GaAs devices. Finally, the temporal response of nuetron-irradiated diamond detectors was 90 ps FWHM, a significant improvement in speed over natural diamond.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 10105869
• Report Number(s): LA-UR--92-3541; CONF-921005--10; ON: DE93003791
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606
440103
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
COMPARATIVE EVALUATIONS
DIAMONDS
GALLIUM ARSENIDES
GAMMA DETECTION
INDIUM PHOSPHIDES
LEAKAGE CURRENT
MATERIALS
NUCLEAR SPECTROSCOPIC INSTRUMENTATION
PHOTODETECTORS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
PROTON DETECTION
RESPONSE FUNCTIONS
SENSITIVITY
TESTING