Chapter_15_Nucl_chem_Part_3_

Chapter_15_Nucl_chem_Part_3_ - Chapter 15, Part 3 Nuclear...

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Unformatted text preview: Chapter 15, Part 3 Nuclear Chemistry Exam III: chapter 14 and chapter 15 Skip Archeological dating Skip Geological dating--- Measurement of Radioactivity The amount of exposure to radiation is measured in Roentgen (R) The extent of ionization in human tissue is measured in rad The rate of disintegration of a radioactive sample is measured in Curies, Ci 1Ci mCi = 0.001 Ci = 10-3 Ci Ci = 10-6 Ci ---- Radiation Detectors Geiger Counter detects ionization caused by radiation Specific films react to radiation as films do to light the greater the radiation the more exposed the film becomes Scintillation counters and computerized equipments for accurate measurement of the amount of a radioactive sample --- Examples of medical applications Radiation therapy (to kill abnormal cells) Positron emission tomography (PET scan) o For imaging Diagnostics o Example: use of radioactive sodium Iodide (I-131) to evaluate thyroid function and/or morphology Thyroid hormone (thyroxin) contains iodine--------------------------------------- Radiation therapy A suitable emitter (i.e. Co-60) is used to kill cancer cells 60 27 Co -> 60 28 Ni + -1 + (Since cancer cells grow faster than normal cells, cancer cells are more likely to be hit by the rays than normal cells)--------------------------------------- http://www.x-icon.com/html/linear_accelerators.html Example of an equipment for radiation therapy--- Positron emission tomography: underlying concept The patient is administered a positron emitter In tissues, an emitted positron may encounter an electron Collision of a positron ( +1 ) and an electron (-1 e) produces two...
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Chapter_15_Nucl_chem_Part_3_ - Chapter 15, Part 3 Nuclear...

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