kombinationsstrahlungsdosimeter for neutrons and gamma rays

摘要

The semiconductor component with at least one p-n junction, esp. a diode is sensitive to neutron radiation and the dose is measured in terms of the change in photo-short circuit current before and after exposure. The end of the housing containing the diode has a window of RPL (radio-photo-luminescent glass) whose property is to emit light in the visible spectrum when illuminated with UV light after exposure to gamma radiation. A second, neutron insensitive but visible light sensitive component, esp. a photo diode may be included in the housing. To read out the photo-short circuit current the device is illuminated by a high-pressure discharge lamp through a filter with a passband in the IR region, the RPL glass window being transparent in this region. For measurement of gamma dose, the photo-blocking current of the diode, or of the additional photo-diode, is measured illuminating the cell in this case by the same lamp but through a filter whose pass band is in the UV region.