Alpha emitting and/or fissile nuclides can be found in a variety of materials, and their number and, in many cases, their distribution can be found using solid state nuclear track detectors.
The solid detector materials employed in semiconductor detectors have a stopping power and efficiency for x and rays that are 2000 to 5000 times greater than gases.
These solid-state devices are transparent to gamma rays and sensitive to charged particles. as opposed to they are physically much smaller than typical detectors. a sensor with a 7 sq. mm sensitivity area.
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