Abstract
A simple, rugged, and inexpensive solid dielectric Compton diode (SCD) has been developed for measuring the radiation-time history of flash x-ray sources. By limiting the physical size of the Compton diode and matching its characteristic impedance to that of the signal cable, a frequency response above 1 GHz has been achieved. The SCD has been used to measure the pulse width and rise time of HERMES III, a pulsed γ-ray simulator. A second, prototype SCD has been built for use with Saturn, a pulsed x-ray simulator. The SCDs do not have high sensitivity, and are thus limited to measurements of dose rate above 109 rads/s, due to signal-to-noise limitations. At lower dose rates, more sensitive detectors such as scintillator photodiodes or p-i-n diodes are more suitable. On the other hand, for dose rates above 1010 rads/s, the more sensitive detectors tend to saturate, while the SCD continues to respond linearly to at least 1012 rads/s. Thus, the SCD is well suited for measuring radiation-time histories at high dose rates on flash x-ray sources.
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