The positron range is defined as the distance the positron travels before it com

Question

The positron range is defined as the distance the positron travels before it combines with an electron and annihilates. which of the following is true about the initial speed and rage of emitted positrons during PET imaging? Answer: Positrons emitted from 15O- water will have a higher initial speed and shorter range compare to positrons emitted from 13 N-ammonia. My question is how the type of the elements ( 11C, 15O, 18F, 82Rb, 13N) and the media ( water, ammonia, blood...)will impact speed and range

Explanation / Answer

The speed of positron depends on the type of the medium we use .More is the difference in the mass of reactant and product,more will be the speed of positron by Einstein Mass energy relation and kinetic energy

While range depends on the medium ,positron is travelling

Normally more is the molecular mass for light elements ,more is delta m (change in mass) so speed will be more and definately range in water is less as it is more ractive to make it to yamma rays

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