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Mariana_6094
#1 Posted : Sunday, May 09, 2021 1:20:52 AM
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Hello, I was doing the Prep 101 After Class practice set #1 and question 7, regarding the passage about iodine isotopes, states that Beta decay is more biologically damaging than Beta decay, but I thought it was the other way around? I just wanted to clarify this. Thank you!!
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Anjali_5681
#2 Posted : Friday, May 14, 2021 4:26:12 PM
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Hi Mariana,

This is one of the situations where not the full story is given here. Due to its mode of beta decay in 131-I, the isotope is much more dangerous to human health than 123-I, despite 123-I engaging in more gamma radiation (of which apparently it has a VERY short life span). The answer would be arrived at by information in the passage, where it specifically states that "90% of the radiative damage is caused by emitted beta particles" (in paragraph with 131-I.

Hope that helps!
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