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Ir atoms

Ir atoms

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter18: Nuclear Reactions
Section: Chapter Questions
Problem 82QAP
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Iridium-192, a beta emitter, is used in medicine to treat certain cancers. The 192ir is used as a wire and inserted near the tumor for a given amount of time and then removed. The 19Ir wire is coated with pure platinum, and is sold by diameter and amount of radiation emitted. One type of wire sold is 139 mm long, has a linear apparent activity of 30-130 MBq/cm, an active diameter (which is the iridium-192) of 0.1 mm, and an outer diameter (the platinum) of 0.3 mm. X Incorrect. (a) How much 192ir is in the wire if the apparent activity is 110 MBq/cm? Enter your answer in scientific notation: 1.53 x 10 i 14 Ir atoms Hint Assistance Used Half-life of Ir-192 is 73.827 d X Incorrect. (b) If the wire is placed in the tumor for 30 hours, how much radiation is absorbed by the tumor? i 1.65 Ci Hint Assistance Used The activity per second is calculated for part (a).
Transcribed Image Text:Iridium-192, a beta emitter, is used in medicine to treat certain cancers. The 192ir is used as a wire and inserted near the tumor for a given amount of time and then removed. The 19Ir wire is coated with pure platinum, and is sold by diameter and amount of radiation emitted. One type of wire sold is 139 mm long, has a linear apparent activity of 30-130 MBq/cm, an active diameter (which is the iridium-192) of 0.1 mm, and an outer diameter (the platinum) of 0.3 mm. X Incorrect. (a) How much 192ir is in the wire if the apparent activity is 110 MBq/cm? Enter your answer in scientific notation: 1.53 x 10 i 14 Ir atoms Hint Assistance Used Half-life of Ir-192 is 73.827 d X Incorrect. (b) If the wire is placed in the tumor for 30 hours, how much radiation is absorbed by the tumor? i 1.65 Ci Hint Assistance Used The activity per second is calculated for part (a).
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