Lecture 8

Lecture 8 - Health Physics Principles EEE 498 EEE 591...

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1/23/2012 Lecture 1 1 Health Physics Principles EEE 498, EEE 591 Lecture 8 Interaction of Radiation with Matter: Alpha Particles Spring 2012, ASU R. Metzger, [email protected], BYEN335 Alpha Rays Range-Energy Relationship Alpha particles releases their energy in a very small range. Therefore, even a piece of paper can shield alpha rays. An alpha particle absorption range is flat. Range: Mean range, Extrapolated range. Lecture 8 2
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1/23/2012 Lecture 1 2 Alpha Rays Range Equations The range of alpha particles in air at 0 o C and 760 mmHg can be computed: If we know the range of alphas in air ( R ), we can calculate its in other medium ( R m ): Range of alpha particles in tissue: where R a and R t are the range in air and tissue; p a and p t are the density of air and tissue. Lecture 8 3 8 2 for MeV 322 . 0 cm 2 / 3 MeV E E R t t a a R R 5 . 0 5 . 0 ) ( ) ( a m m m a a A R A R Alpha Rays Range Example: What is the range of a 210 Po alpha particle in tissue? E=5.3 MeV What is the range of this alpha particle in Al? Lecture 8
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Lecture 8 - Health Physics Principles EEE 498 EEE 591...

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