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Patent Granted Disclosed are particulates of calcium oxide and calcium hydroxide which are suitably used for filling a gas fixing unit (32) of a fixation device (3) for a halide gas. Particularly disclosed are those particulates highly reactive with a halide gas or a decomposition product thereof. Specifically disclosed is a porous calcium oxide particulate composed of spherical porous calcium oxide particles, which has a BET specific surface area of not less than 50 m<SP>2</SP>/g.
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