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TITANIUM AS AN ENCASEMENT FOR COBALT 60 WITH SPECIAL REFERENCE TO A PNEUMATIC AFTERLOADING THERAPY UNIT

J. ERNEST BREED M.D.1, CHIEH HO PH.D.2, and DAVID S. BREED PH.D.3

1 Associate in Radiology, Northwestern University Medical School, Chicago, Illinois.
2 Assistant Professor of Nuclear Science, Columbia University, New York, New York.
3 Breed Corporation, Fairfield, New Jersey.

Titanium provides an ideal encasement for radioactive cobalt 60. Sources may be encased before being irradiated in the pile since the small amount of radioactivity induced in the titanium is soon dissipated due to its short half life. Titanium is hard, tough, chemically resistant and very light in weight.

It is being used in a new afterloading remote controlled unit called the Pneumatron in the form of small ball-bearings, 1/8 inch in diameter with 1 cu. mm. of radioactive cobalt 60 in the center. Several such balls are transferred through a plastic tube by pneumatic pressure from a storage container to a prefixed applicator. The average treatment time is from 2 to 5 minutes, following which the radioactive balls are returned to the storage container also by pneumatic pressure.

This mechanism makes possible the high intensity proximity therapy of accessible tumors. It is particularly useful in the treatment of cancers of the skin, lips, mouth, cervix and for irradiation of the chest wall in patients with cancer of the breast.


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