lecture 2

lecture 2 - Lecture 1 Health Physics Principles EEE 498,...

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Unformatted text preview: Lecture 1 Health Physics Principles EEE 498, EEE591 Lecture 2 Introduction; Review of Physical Principles: Energy Transfer, Quantum Theory Spring 2012, ASU Robert Metzger,, GWC 387 Energy Transfer Elastic Collision: Between two bodies in which kinetic energy and momentum are conserved. Collision between two billiard balls Usually collisions between a high energy neutron and a nucleus with a small Z number. Inelastic Collision: If in a collision the kinetic energy is not conserved the collision is inelastic. Collision between a hard billiard ball and a rubber band. Collision between a high energy neutron and a nucleus might be inelastic. Lecture 2 Elastic Collision Lecture 2 2 2 1 1 2 2 2 2 2 1 2 1 2 1 2 1 2 1 2 1 mv MV mv MV mv MV mv MV + = + + = + M m V 1 v 1 Before: M m V 2 v 2 After: Elastic Collision (Cont.) The maximum energy transferred, T , from an energetic projectile (such as a neutron) with energy E to an atom in an elastic head-on collision is: where is: Lecture 2 E T = 2 ) ( 4 M m mM + = Elastic Collision (Cont.) Example: What is the maximum energy that can be transferred from a 1-MeV proton to a) a Si atom, b) to an O atom, and c) to C-12: a) b) Lecture 2 MeV 13 . MeV 1 13 . 13 . ) 28 1 ( 28 1 4 ) ( 4 2 2 = = = = + = + = H Si Si H Si H E T M m M m MeV 22 . MeV 1 22 . 22 . ) 16 1 ( 16 1 4 ) ( 4 2 2 = = = = + = + = H O O H O H E T M m M m Inelastic Collision If is the binding energy of the atom: where E A is the energy loss by the neutron and E B is the energy gained by the atom. Lecture 2 atom neutron = A B E E Lecture 1 Waves Energy can be transmitted by disturbing a medium. where v is the velocity with which a wave travels, f is frequency and is wavelength....
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This note was uploaded on 02/11/2012 for the course EEE 498 taught by Professor Barnaby during the Spring '08 term at ASU.

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lecture 2 - Lecture 1 Health Physics Principles EEE 498,...

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