Lecture1 - ENU 4612C/5615C Nuclear Radiation Detection and...

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Unformatted text preview: ENU 4612C/5615C Nuclear Radiation Detection and Instrumentation Lecture 1 Radiation Sources Laboratory-scale sources and background radiation Energy range: 10 eV to 20 MeV Ionizing Radiations: E > 10 eV For photons: Introduction J x eV 19 10 602 . 1 1 = ) 10 x 4.135 or , 10 x (6.626 constant s Planck' c/ frequency; 15- 34- s eV s J h h E = = = = V q d d V q qEd Fd W = = = = Radioactivity (activity of a radioactive source) = N dt dN decay = Ra) 1g of (activity tions/sec disintegra 10 7 . 3 1 (Ci) Curie : Unit l Traditiona 226 10 x Ci = sec / tion disintegra 1 1 (Bq) Becquerel : Unit SI = Bq 2 / 1 2 ln constant decay pe radioisoto T = = Introduction Solution to Decay Law Decay Chains (for first daughter) N dt dN = Introduction = = dt N dN dt N dN C t t N + = ) ( ln ) ( , at ) ( N A t N t Ae t N t = = = = t e N t N = ) ( Z Y X X Y Y Y X X Y N N dt dN = = rate decay - rate production Origin of the Radiations - unstable nuclei (natural, man-made) Nuclear Processes Atomic Processes Type of radiation Classification ray gamma neutron positron electron, , nucleus helium + n energy) (continues ung Bremstrahl energy) (discrete ray - electron Auger X e Charged: 1. Fast electron sources 2. Heavy charged particle sources Uncharged: 3. Sources of electromagnetic radiation 4. Neutron Sources 1. Fast Electron Sources A. Beta Decay B. Internal Conversion C. Auger electrons A. Beta DecayA....
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This note was uploaded on 12/10/2011 for the course ENU 4612c taught by Professor Ghita during the Fall '11 term at University of Florida.

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Lecture1 - ENU 4612C/5615C Nuclear Radiation Detection and...

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