OREGON STATE UNIVERSITY
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AT Farsoni, DM Hamby. "Simultaneous beta and gamma spectroscopy". Oregon State University, Aug 2008.
US Patent 7683334
The Beta-Gamma Digital Spectrometer was developed to address shortcomings and inefficiencies with older devices and methods for measuring beta particle spectra. Previous methods measured the radiation sources twice: once with the detector unshielded and once with the detector shielded by material sufficient to stop the beta particles. The two spectra were then subtracted to obtain the beta particle energy distribution. This method has several problems, which include doubling the time to measure the spectrum, distortions in the energy spectrum due to inherent spectrometer instabilities, and difficulties discriminating between gamma and beta interactions. The Beta-Gamma Digital Spectrometer is able to overcome these problems by implementing a "phoswich" detector design, which uses three scintillation layers (BC-400, NaI(Tl), and CaF2) and a customizable digital pulse processing algorithm to simultaneously record the beta and gamma energy spectra from a mixed source.
DM Hamby, AT Farsoni, E Cazalas. "Skin contamination dosimeter". Oregon State University, Oct 2010.
US Patent 7964848
Complimenting the work with VARSKIN, the development of a small radiation dosimeter is underway that is capable of three simultaneous depth-dose measurements for both photon and beta dosimetry. The method utilizes previouslydeveloped beta-gamma spectroscopy phoswich systems.
