Abstract: A photodiode with integrated microporous filter formed on a semiconductor substrate is provided. The microporous filter will provide in excess of six orders of magnitude visible light reduction while transmitting a measurable amount of UV/EUV radiation. A process for manufacturing the photodiode with integrated microporous filter is also presented.

Abstract: A radiometric quality semiconductor photodiode with one electrical contact extending from a p-n junction at the photodiode surface to the back of the photodiode substrate and a second contact formed on the back of the semiconductor substrate is provided and a method for manufacturing is presented. The electrical contact channel extending from the p-n junction to the photodiode substrate will be formed by dry etching and will require a cross sectional area of only 0.125 mm×0.125 mm.

Abstract: A nuclear radiation level detector includes an ionization chamber. Within the ionization chamber are spaced electrodes. The space between the electrodes communicates with the atmosphere so as to expose the electrodes to the atmosphere. A voltage source applies a potential across the electrodes. When the atmosphere is not contaminated with nuclear radiation above a reference level, the current flow between the electrodes is nil or substantially so. In the event the atmosphere is contaminated with nuclear radiation above a reference level, a measurable current flows between the electrodes. A measurement and alarm circuit operates an alarm in response to the current flow between the electrodes of a measurable magnitude.