Chapter 21: Q19E (page 1204)
Question:What are the types of radiation emitted by the nuclei of radioactive elements?
Short Answer
Types of radiation emitted by radioactive elements:
Alpha particles, beta particles, gamma rays, and neutrons.
Chapter 21: Q19E (page 1204)
Question:What are the types of radiation emitted by the nuclei of radioactive elements?
Types of radiation emitted by radioactive elements:
Alpha particles, beta particles, gamma rays, and neutrons.
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Get started for freeIodine that enters the body is stored in the thyroid gland from which it is released to control growth and metabolism. The thyroid can be imaged if iodine\({\rm{ - 131}}\)is injected into the body. In larger doses, I\({\rm{ - 133}}\)is also used as a means of treating cancer of the thyroid. I\({\rm{ - 131}}\)has a half-life of\({\rm{8}}{\rm{.70}}\)days and decays by\({\rm{\beta - }}\)emission. (a) Write an equation for the decay. (b) How long will it take for\({\rm{95}}{\rm{.0\% }}\)of a dose of I\({\rm{ - 131}}\)to decay?
Calculate the density of the\(_{12}^{24}Mg\)nucleus in\(g/mL\), assuming that it has the typical nuclear diameter of \(1 \times 1{0^{ - 13}}\;cm\)and is spherical in shape.
Technetium\({\rm{ - 99 m}}\)has a half-life of\({\rm{6}}{\rm{.01}}\)hours. If a patient injected with technetium\({\rm{ - 99 m}}\)is safe to leave the hospital once\({\rm{75\% }}\)of the dose has decayed, when is the patient allowed to leave?
A laboratory investigation shows that a sample of uranium ore contains \({\rm{5}}{\rm{.37 mg}}\) of \({}_{{\rm{92}}}^{{\rm{238}}}{\rm{U}}\) and \({\rm{2}}{\rm{.52 mg}}\)of \({}_{82}^{{\rm{206}}}{\rm{Pb}}\). Calculate the age of the ore. The half-life of \({}_{{\rm{92}}}^{{\rm{238}}}{\rm{U}}\)is \({\rm{4}}{\rm{.5 \times 1}}{{\rm{0}}^9}yr\).
In usual practice, both a moderator and control rods are necessary to operate a nuclear chain reaction safely for the purpose of energy production. Cite the function of each and explain why both are necessary.
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