Question

For the isotope yttrium-91 (Z=39), the half-life is 58.5 days. What percentage of an initial sample of yttrium-91 remains after 145 days?

Next question: A patient receives an absorbed dose of 0.120 mGy from the neutron radiation with a relative biological effectiveness of 18.0. What is the dose equivalent? Note: mGy=1.0 x 10^-3 Gy and 1.0mSv= 1.0 x 10^-3 Sv

Answer #1

The concept used in this question is of relationship between half-life and decay constant , after applying this concept i deduced the value.

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Jack underwent radiation therapy using a beam of neutrons to
treat a skin cancer on his hand. He received a dose equivalent of
20 mSv that was absorbed in 23 g of tissue. The relative
biological effectiveness (RBE) of these neutrons is 10.
What absorbed dose of radiation did Jack receive? In Gy
What was the total energy of the absorbed radiation? in J
Suppose Jill, also being treated for skin cancer, received the
same absorbed dose, but from an electron...

A certain radioisotope has a half-life of 8.96 days. What
percentage of an initial sample of this isotope remains after 20
days?

A certain radioisotope has a half-life of 10.1 days. What
percentage of an initial sample of this isotope remains after 37
days?

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