S10_Lec6N

S10_Lec6N - CHM 11500 Lecture 6, 06-22-10 Nuclear Chemistry...

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Unformatted text preview: CHM 11500 Lecture 6, 06-22-10 Nuclear Chemistry and Atomic Structure Reading: Chapter 6 Units of Radioactivity Activity or disintegrations (transformations) per unit of time is expressed in units of curies (Ci) or in the SI unit of becquerels (Bq) One becquerel = 1 disintegration per second (s-1 ). One curie = 3.7 x 10 10 disintegrations per second = 3.7 x 10 10 becquerels Units of Dose Not all types of radiation are absorbed to the same extent. Different types of radiation deposit different amounts of energy when absorbed by the body. A Gray is the SI unit of absorbed dose. gy = 1 joule / kg of body tissue = 100 rads Radiation Equivalents Particle Relative energy deposited Relative Biological Effectiveness γ 1 e- 1 1 1 p 5 1 n 1 - 100 4 2 He 20 rem = RBE x rads Radiation Damage 1 gy = 1 J/kg 4 gy/ 1 g H 2 O raises the temperature by 4 o C Radiation damage is not due to heating, it results from breaking chemical bonds in a body producing free radicals. Free radical, unpaired e- Radiation Damage The body can handle and repair a certain amount of free radical damage whether it is caused by radiation, drinking alcohol, heavy labor, heavy exercise, eating slightly rancid food, or from wounds. Radiation sickness is a free radical disease just as a hang-over is. Radiation Damage...
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This note was uploaded on 04/23/2011 for the course CHEM 115 taught by Professor L during the Summer '02 term at Purdue.

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S10_Lec6N - CHM 11500 Lecture 6, 06-22-10 Nuclear Chemistry...

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