lecture 1

lecture 1 - What is Health Physics? Some Background: Health...

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Lecture 1 Health Physics Principles EEE 498, EEE591 Lecture 1 Introduction; Review of Physical Principles: Mechanics, Relativistic Effects, Electricity Spring 2012, ASU Bob Metzger, rlmetzger@asu.edu , GWC 387 What is Health Physics? • Some Background: – Radiation can be defined as the propagation of energy from point to point through space or matter. There are two ways to do it. – Particulate Radiations: Here the energy is transferred through the kinetic energy of a atomic particle. Examples are electrons, protons, beta particles, alpha particles, fission fragments, etc. – Electromagnetic Radiations: Here the energy is transferred without a particle with mass. The electromagnetic spectrum is large. EEE 498, ASU, R. Metzger Lecture 1 2 The Electromagnetic Spectrum EEE 498, ASU, R. Metzger Lecture 1 3 Electromagnetic Spectrum • The large electromagnetic spectrum is divided into areas that are considered to be ionizing and non-ionizing radiations. • Ionizing radiations deliver sufficient quanta of energy to a hydrogen atom (e.g. a human cell) to knock an electron out of the orbit, producing a positively charged nucleus and a free electron. • Requires about 10 to 20 eV/ion pair. Ionizing Radiations • For the electromagnetic spectrum, wavelengths starting in the UV region and above are ionizing radiations. • So, the far UV, x-rays, gamma rays, and cosmic radiations are ionizing radiations. • All wavelengths below UV are non- ionizing. • All of the particulate radiations are ionizing. Electromagnetic Radiation
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Lecture 1 What is Health Physics? • If you consider one of the points in the definition of radiation to be human tissue, then Health Physics is the study of all aspects of the interaction of the radiation with the tissue. • It includes both ionizing and non-ionizing
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lecture 1 - What is Health Physics? Some Background: Health...

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