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Chapter 42: Q 20 Exercise (page 1236)
A sample of 1.0x1010atoms that decay by alpha emission
has a half-life of 100 min. How many alpha particles are emitted
between t = 50 min and t = 200 min?
Therefore are emitted between t=50 min and t = 200 min.
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| The element gallium has two stable isotopes: 69 Ga with an atomic mass of 68.92 u and 71 Ga with an atomic mass of 70.92 u. A periodic table shows that the chemical atomic mass of gallium is 69.72 u. What is the percent abundance of 69 Ga?
A chest x ray uses 10 keV photons with an RBE of 0.85. A 60 kg person receives a 0.30 mSv dose from one chest x ray that exposes 25% of the patient’s body. How many x ray photons are absorbed in the patient’s body?
How many half-lives must elapse until (a) 90% and (b) 99% of a radioactive sample of atoms has decayed?
The rate at which a radioactive tracer is lost from a patient’s body is the rate at which the isotope decays plus the rate at which the element is excreted from the body. Medical experiments have shown that stable isotopes of a particular element are excreted with a 6.0 day half-life. A radioactive isotope of the same element has a half-life of 9.0 days. What is the effective half-life of the isotope, in days, in a patient’s body?
Are the following decays possible? If not, why not?
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