Dark Matter Detection is an important issue in both cosmology and particle physics. WIMPs (Weakly Interacting Massive Particles) are one of the most promising candidates for dark matter. The XENON group has the most sensitive detector in the world, however, they reported no significant signal. On the other hand, the DAMA/LIBRA group reports the annual modulation by NaI(Tl), however, their sensitivity is less than the one reported by XENON group. From the perspective of the scientific control, the verification of the annual modulation of the DAMA/LIBRA group is essential to use NaI(Tl) crystals with backgrounds comparable to those of them. PICOLON (Pure Inorganic Crystal Observatory for Low-energy Neut(ra)lino) aims to search for dark matter using ultra-pure NaI(Tl) crystals and to verify the annual modulation reported by the DAMA/LIBRA group. We report the background of a new PICOLON crystal (Ingot~\#94) developed using the Ingot~\#85 purification method.