When unsealed
85Kr β-irradiation facilities are used for chemical reactions in liquid phase, the
85Kr gas must be removed from the reaction system after irradiation, and the radioactive concentration reduced to a level below (MPC)
w. Removal experiments were carried out with water and with an aqueous solution of polyacrylamide using a reaction vessels of 1l capacty containing a
85Kr radiation source of 290Ci. The methods of removal and the results obtained therewith are discussed.
The removal is accomplished by the combined use of freeze-pump-thaw cycles, N
2-stripping and standing at room temperature. The overall decontamination factor reaches 10
8.
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