Application of low-cost Gallium Arsenide light-emitting-diodes as kerma dosemeter and fluence monitor for high-energy neutrons.
Displacement damage (DD) caused by fast neutrons in unbiased Gallium Arsenide (GaAs) light emitting diodes (LED) resulted in a reduction of the light output. On the other hand, a similar type of LED irradiated with gamma rays from a (60)Co source up to a dose level in excess of 1.0 kGy (1.0 x 10(5) rad) was found to show no significant drop of the light emission. This phenomenon was used to develop a low cost passive fluence monitor and kinetic energy released per unit mass dosemeter for accelerator-produced neutrons. These LED-dosemeters were used to assess the integrated fluence of photoneutrons, which were contaminated with a strong bremsstrahlung gamma-background generated by the 730 MeV superconducting electron linac driving the free electron laser in Hamburg (FLASH) at Deutsches Elektronen-Synchrotron. The applications of GaAs LED as a routine neutron fluence monitor and DD precursor for the electronic components located in high-energy accelerator environment are highlighted.
Mukherjee
B
B
Deutsches Elektronen-Synchrotron (DESY) Notkestrasse 85, D-22607 Hamburg, Germany. mukherjee@ieee.org
Simrock
S
S
Khachan
J
J
Rybka
D
D
Romaniuk
R
R
D001152:Arsenicals / Q000191:economics / Q000528:radiation effects*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005708:Gallium / Q000191:economics / Q000528:radiation effects*; D005858:Germany; D008029:Lighting / Q000191:economics / Q000295:instrumentation*; D009502:Neutrons; D010783:Photometry / Q000191:economics / Q000295:instrumentation*; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000191:economics / Q000295:instrumentation* / Q000379:methods; D011835:Radiation Protection / Q000191:economics / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012666:Semiconductors; D012680:Sensitivity and Specificity
D001152:Arsenicals; C043055:gallium arsenide; D005708:Gallium