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Seeds with
131
Cs Radioactive Isotope
•
131
Cs isotope was suggested for BRT use back in 1960s
(Henschke & Lawrence 1965)
•
Based on Invention made by Donald C. Lawrence in 1967
•
Developed by IsoRay, Inc. (Richland, WA, USA)
•
Received FDA 510(k) clearance in 2003
•
In 2009 FDA clearance for head & neck, lung and other
sites (Proxcelan™
131
Cs Brachytherapy Seeds)