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ProblemSet_8_2009-2

ProblemSet_8_2009-2 - 22 Introduction to Ionizing Radiation...

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22 Introduction to Ionizing Radiation Autumn 2009 Problem Set 8 Date Due: 3 December 2009 1. Distinguish between “direct” and “indirect” effects of radiation. Give an example of the sequence of events beginning with energy deposition in tissue (you choose the radiation type) and ending in cell death for both the direct and indirect actions of radiation in a cell. 2. Why do the G values for the reactant species H 3 O + , OH , H and e - aq decrease between 10 -11 sec and 10 -6 sec? Are they constant after 10 -6 sec? Explain. What do you expect to happen to the molecular species H 2 O 2 and H 2 during the same time? Explain. 3. If a 20 keV electron stops in water and an average of 352 molecules of H 2 O 2 are produced, what is the G value for H 2 O 2 for electrons of this energy? 4. If the G value for hydrated electrons produced by a 20 keV electron is 1.13, how many of them are produced, on the average, when a 20 keV electron stops in water?
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