3 years ago

Measurement of low-energy background events due to $^{222}$Rn contamination on the surface of a NaI(Tl) crystal.

H.K. Park, K.W. Kim, Y.D. Kim, N.Y. Kim, H.S. Lee, C. Ha, B.J. Park

It has been known that decays of $^{222}$Rn and its daughter elements on the surface of a detector cause significant background at energies below 10~keV. In particular $^{210}$Pb and $^{210}$Po decays on the crystal surface result in significant background for dark matter search experiments with NaI(Tl) crystals. In this report, measurement of $^{210}$Pb and $^{210}$Po decays on surfaces are obtained by using a $^{222}$Rn contaminated crystal. Alpha decay events on the surface of $^{210}$Pb are measured by coincidence requirements of two attached crystals. Due to recoiling of $^{206}$Pb, rapid nuclear recoil events are observed. A mean time characterization demonstrates that $^{206}$Pb recoil events are distinct from those of sodium or iodine nuclear recoil events, as well as electron recoil events.

Publisher URL: http://arxiv.org/abs/1801.06948

DOI: arXiv:1801.06948v1

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