Shielding design for a Cs-137 rod-type standard point source for well chamber constancy checks

Mahsheed Sabet, D. Cryer, David Waterhouse

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Well type chambers are used for radioactive source calibrations in brachytherapy, but do not provide radiation shielding. Routine constancy checks on a well chamber are required between periodic secondary standard laboratory calibrations to ensure consistent device performance, and ultimately to ensure accurate patient dose delivery. In this work, a method is described to provide suitable shielding for a Cs-137 rod-type point source to enable use for constancy checks. A novel plunger-type shielded housing was designed and constructed for the Cs-137 source that when combined with a suitably shielded well-chamber container minimised user exposure during constancy checks. The designed shielding proved effective, and a constancy test routine was established and used for the past 16 months. The well chamber showed consistent performance (0.12 ± 0.18 % from the baseline) and no increased exposure was reported on users’ radiation badges. © 2016, Australasian College of Physical Scientists and Engineers in Medicine.
Original languageEnglish
Pages (from-to)951-956
Number of pages6
JournalAustralasian Physical & Engineering Sciences In Medicine
Issue number4
Publication statusPublished - 2016


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