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Basics of medical physics

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The University of Lahore


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Name : M.Shoaib Reg No: MPHY01191034 Msc 4(morning) Subject: INTRODUCTION OF MEDICAL PHYSICS Topic: Give brief introduction of X-rays production . Explain Characteristic and bremsstrahlung x-rays.Describe also about applications of X-rays in medicine,Industry and science Production of X-rays: INTRODUCTION: X-rays are a type of electromagnetic radiation. • Other types of electromagnetic radiation are radio waves, microwaves, infrared, visible light, ultraviolet, and gamma rays. • The types of radiation are distinguished by the amount of energy carried by the individual photons. • All electromagnetic radiation consists of photons, which are individual packets of energy. For example, a household light bulb emits about 1021 photons of light (non-ionizing radiation) per second. • The energy carried by individual photons, which is measured in electron volts (eV), is related to the frequency of the radiation. • Different types of electromagnetic radiation and their typical photon energies are listed in the table on the next slide. Electromagnetic Radiation X-rays ionize atoms. • The energy required for ionization varies with the material (e.g., 34 eV in air, 25 eV in tissue) but is generally in the range of several eV. • A 100 keV X-ray can potentially create thousands of ions. • X-rays originate from atomic electrons and from free electrons decelerating in the vicinity of atoms (i.e., Bremsstrahlung). X-Rays and Ionization Radiation-producing devic ...
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