Doses and Biological Effects

Conversely a positron may be created when the nucleus has too many protons to be stable and it is the changing of a proton into a neutron with the subsequent release of a positron particle that accounts for the genesis positrons.

 

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However a positron will eventually decay to produce two gamma rays (also know as annihilation radiation) which each have an energy of 511keV and move approximately 180 degrees apart (not exactly as the conservation of momentum will require the residual momentum of the positron to be reflected in the two gamma rays).

Hence the full attenuation of the positron radiation, taking the annihilation radiation into consideration, will not be fully absorbed by the 6mm perpsex.

 

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