Trapping System for Radioactive Gas

Abstract

A safe and efficient system is described for trapping radioactive gas (xenon) from expired air. The instrument must be protected from CO 2 and H 20, which would :fill its absorbing space, by inserting chemical absorbers for these components ahead of the cryogenic trap. The trap construction is given in detail.

Trapping and re-use system for radioactive xenon in nuclear medicine

“…Trapping of xenon for medical purposes has been discussed in a number of recent papers. A cryogenic system has been described by Mantel, Cook and Corrigan (1968) and Corrigan Mantel and Corrigan (1970), using liquefied nitrogen as the coolant. The use of activated charcoal for containment of 133Xe was discussed by Liuzzi, Keaney and Freedman (1972) and Timpe (1976) and the former also noted the possibility of recycling the trapped xenon.…”

“…Vaalburg, Peset, Beekhuis, Woldring and Tammeling (1971) have briefly described a recovery system for lung function studies using 100 g of activated charcoal chilled to -80 'c. A. refrigerated system was also described by Forouzan-Rad (1976) who used steam for releasing the trapped xenon.…”