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Chapter 42: Q 33 Exercise (page 1237)
The doctors planning a radiation therapy treatment have determined that a 100 g tumour needs to receive 0.20 J of gamma
radiation. What is the dose in grays?
Hence, the dose in grays is 2 grays.
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The activity of a sample of the cesium isotope , with a half-life of 30 years, is . Many years later, after the sample has fully decayed, how many beta particles will have been emitted?
a. Is the binding energy of a nucleus with more than, less than, or equal to the binding energy of a nucleus with ? Explain.
b. Is a nucleus with more tightly bound, less tightly bound, or bound equally tightly as a nucleus with ? Explain.
The radium isotope 226Ra has a half-life of 1600 years. A
sample begins with 1.00x1010 226Ra atoms. How many are left
after (a) 200 years, (b) 2000 years, and (c) 20,000 years?
The radioactive hydrogen isotope 3H, called tritium, has a
half-life of 12 years.
a. What are the decay mode and the daughter nucleus of tritium?
b. What are the lifetime and the decay rate of tritium?
a. What are the isotopic symbols of all A = 19 isobars?
b. Which of these are stable nuclei?
c. For those that are not stable, identify both the decay mode and the daughter nucleus.
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