Saturday, May 31, 2014

Concentration of gamma radiation for medical purposes

Problem: in the absence of lenses for gamma rays, radiation therapy damages outlying tissues. Large doses become problematic.



Solution: use geometric discrimination to filter gamma rays propagating in select directions. Isotope core has a form of a tablet; system of metallic concentric cones attenuates radiation except for propagating in approximately paraxial direction.

Prior Art: Coded mask techniques in gamma-ray astronomy.

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