The SRNL developed GrayQb is a passive, low cost gamma radiation mapping device which uses a tungsten pinhole and a phosphor storage plate (PSP) to generate images. Presently, the device requires retrieval to extract images off the PSP using an external scanner. In partnership with Los Alamos National Lab (LANL), SRNL has developed an in-situ GrayQb radiation mapping device eliminating the need to remove the radiation sensitive phosphor storage plate (PSP) from the device for scanning between exposures. By incorporating a customized version of the LANL patented MiniMax camera-based PSP reader system into the GrayQb housing, the exposed PSP can now be read in-situ and digitally transmitted to a remote computer for viewing. In-situ imaging is a valuable addition to GrayQb because of the reduced need of personnel interaction which mitigates risk as well as the option for multiple images being acquired during one deployment. Upgrades implemented which allow for in-situ imaging to be performed include using the tungsten pinhole, a PSP, red LEDs, a blue light filter, and a commercial off the shelf (COTS) color camera. The images are transmitted wirelessly to an external computer. This presentation will discuss the selection, characteristics, and testing of the camera-based PSP reading system, improved PSP materials, and the results/performance of the upgraded GrayQb device. Testing has been performed with simulated radiation exposures as well as A-241 and Cs-137 button sources. These upgrades and tests have been performed over a 12-month period and this presentation will be a summary and conclusion to this year long project.
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