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The dark matter observation claim by the DAMA/LIBRA collaboration has been along-standing puzzle within the particle physics community. Efforts of otherresearch groups to verify the claim have been insufficient by significantradioactivity of present NaI(Tl) crystals. PICOLON (Pure Inorganic CrystalObservatory for LOw-energy Neut(ra)lino) experiment conducts independent searchfor Weakly Interacting Massive Particles (WIMPs) using NaI(Tl) crystals. OurNaI(Tl) crystal manufactured in 2020 (Ingot #85) reached the same purity levelas DAMA/LIBRA crystals. In this report, we describe the radiopurity of the newIngot #94 crystal produced using the same purification technique as Ingot #85.The $\alpha$-ray events were selected by pulse-shape discrimination method. Theimpurities in the Ingot #94, $^{232}$Th, $^{226}$Ra and $^{210}$Poradioactivity were $4.6\pm 1.2~\mathrm{\mu Bq/kg}$, $7.9\pm 4.4~\mathrm{\muBq/kg}$, and $19\pm 6~\mathrm{\mu Bq/kg}$, which are equivalent to those of theDAMA/LIBRA crystals. The background rate in the energy region of 2-6 keV , was2-5 events/d/kg/keV without applying a veto trigger.

Radiopurity of NaI(Tl) crystals for PICOLON dark matter experiment