Encapsulated low-energy brachytherapy sources
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United States of America Patent
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Aug 8, 2000
Grant Date -
N/A
app pub date -
Feb 11, 1999
filing date -
Feb 12, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An essentially cylindrical, metal-encapsulated, brachytherapy source including an outer metal capsule, an annulus in a central interior position of said outer metal capsule, and a longitudinally extending heavy metal core in said annulus. The annulus is made of the same metal as said outer metal capsule. One or more low-profile welds are formed around the central circumference of the outer metal capsule for attaching the outer metal capsule to the annulus and for sealing the outer metal capsule. A plurality of substrate particles each having bound thereto a radioisotope are positioned in the outer metal capsule so that the radioisotope is distributed symmetrically within the source, equally divided between the two ends of the source, and positioned with a strong bias towards the extremes of the two ends of the source.
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