Abstract:Low radioactive material screening is becoming essential for rare event search experiments, such as neutrinoless double beta decay and dark matter searches in underground laboratories. A gaseous time projection chamber (TPC) can be used for such purposes with large active areas and high efficiency. A gaseous TPC with a Micromegas readout plane of approximately 20×20 cm 2 is successfully constructed for surface alpha contamination measurements. We have characterized the energy resolution, gain stability, and tr… Show more
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