A silicon array detector for high-energy betas

The detection of significant levels of certain gamma and beta emitting isotopes could allow on-site Inspection teams working under the Comprehensive Test Ban Treaty to localize probable vent and fissure locations. Thus, sophisticated drilling and radionuclide measurements could then be made more effectively allowing for a higher probability of correctly identifying a nuclear event. In order to address this need we have developed a silicon array coupled with a Nal for detecting gammas, high-energy betas, and beta–gamma coincidences. The pursuit of this detection method is now viable since large-area, high-purity silicon wafers are now commercially available making this layered, large-area technique technically and economically feasible. We have designed, constructed, and tested a prototype detector system and we will present out initial test data.