  The amount of radioactive impurities contaminated in the detector gases is
required to be kept at a very low level for rare event particle physics such as
dark matter and neutrino observation experiments. Zeolite is a well-known class
of materials and is one of the possible candidates for removing impurities from
these gases. At the same time, the amount of radioactive impurities released
from the adsorbent material needs to be sufficiently small. In this paper, a
development of a new ultralow radioactive zeolite as a product of the selection
of ultralow radioactive materials is reported. Results on the radon emanation
and impurity adsorption from argon gas measurements are also described.
