chm115_lecture7

chm115_lecture7 - Chemistry 115 Lecture 7 Outline Chapter...

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Unformatted text preview: Chemistry 115 Lecture 7 Outline Chapter 23 Radiation, Dosages Nuclear Medicine HW3: Due Wed Feb 2, 11pm Recitation: Ch 23: Nuclear Reactions, Radiation, Doses, Nuclear Medicine and chapter wrap-up. EXAM 1: Tuesday Feb 15. Covers review material in Chap. 1,2 4, 11, and Nuclear, Chap 23. (Lectures 1-7). Radiation Radiation when it interacts with matter can cause two effects: Non-ionizing radation causes atoms to vibrate matter gains heat Ionizing radiation causes loss of electron(s): Atom ion + + e- This type of radiation can be dangerous because it causes reactive radical species. Radiation Penetrating Power 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 1 e- 1 1 1 p 5 1 n 1 - 100 4 2 He 20 Dose: rem = RBE x rads Rem = Roentgen Equivalent Man Radiation Damage...
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chm115_lecture7 - Chemistry 115 Lecture 7 Outline Chapter...

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