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Chapter 42: Q.56 (page 1237)
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?
Dose
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The half-life of 60Co is 5.27 years. The activity of a 60Co
sample is 3.50 x 109 Bq. What is the mass of the sample?
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.
Calculate the chemical atomic mass of silicon.
Stars are powered by nuclear reactions that fuse hydrogen into helium. The fate of many stars, once most of the hydrogen is used up, is to collapse, under gravitational pull, into a neutron star. The force of gravity becomes so large that protons and electrons are fused into neutrons in the reaction p+ + e- S n + n. The entire star is then a tightly packed ball of neutrons with the density of nuclear matter. a. Suppose the sun collapses into a neutron star. What will its radius be? Give your answer in km. b. The sun’s rotation period is now 27 days. What will its rotation period be after it collapses? Rapidly rotating neutron stars emit pulses of radio waves at the rotation frequency and are known as pulsars
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?
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