52_100_Lecture_9_25_07

52_100_Lecture_9_25_07 - 9/24/2007 Nuclear Chemistry-The...

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9/24/2007 1 Nuclear Chemistry-The Good Smoke Detectors (Am-241) Food preservation – strawberries, pork Weld Inspections (Ir-192) Paper Manufacturing – Thickness of paper Medicine – Tracers (where did it go) and imaging (and a picture) Radiation treatments – blast the bad cells Making new elements Making new elements! Dating of objects Smoke Detectors
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9/24/2007 2 Smoke Detectors Ionization chamber Smoke Detectors Ionization Chamber
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9/24/2007 3 Am Æ Np + He 241 237 4 Alpha source smoke Smoke Detectors Am Np + He 95 93 2 Nuclear Chemistry-The Good Smoke Detectors (Am-241) Food preservation – strawberries, pork Weld Inspections (Ir-192) Paper Manufacturing – Thickness of paper Medicine – Tracers (where did it go) and imaging (and a picture) Radiation treatments – blast the bad cells Making new elements Making new elements! Dating of objects
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9/24/2007 4 Ionizing Power 1 out of every 3 hospital patients will undergo a nuclear medicine procedure 24 Na, t ½ = 14.8 hr, b emitter, blood-flow tracer 131 I = 14 8 hr b emitter thyroid gland activity Radioisotopes in Medicine I, t ½ = 14.8 hr, b emitter, thyroid gland activity 123 I, t ½ = 13.3 hr, g-ray emitter, brain imaging 18 F, t ½ = 1.8 hr, b + emitter, positron emission tomography 99m Tc, t ½ = 6 hr, g-ray emitter, imaging agent Brain images with 123 I-labeled compound
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9/24/2007 5 Iodine and the Thyroid Gland Iodine-131 emits β and γ rays allowing an image to be obtained Sensitivity of instrument allows image without damage to gland or other parts of the body Larger dosages can be used to kill some thyroid cells to prevent a condition known as hyperthyroidism Causes weight loss, rapid heartbeat, general irritability and apparent enlargement of eyeballs Detection of Disease One of the most effective methods to detect cancers is by imagining due to EM radiation or by isotope detection.
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9/24/2007 6 Tc-99m indicates that it is metastable and readily decays with loss of γ rays.
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This note was uploaded on 04/03/2008 for the course CHEM 101 taught by Professor Hawrelak during the Fall '07 term at Bloomsburg.

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52_100_Lecture_9_25_07 - 9/24/2007 Nuclear Chemistry-The...

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