A gaseous time projection chamber with Micromegas readout for low-radioactive material screening

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 purposes with large active areas high efficiency. TPC a Micromegas readout plane of approximately $$20 \times 20$$ $$\hbox {cm}^2$$ successfully constructed surface alpha contamination measurements. We have characterized the energy resolution, gain stability, tracking capability calibration sources. With unique track-related background suppression cuts TPC, we established that rate ( $$0.13\pm 0.03$$ ) $$\times 10^{-6}$$ Bq/ , comparable to leading commercial solutions.