The half-life of radium is 1590 years. In how many years shall the earth lose all its radium due to radioactive decay?
Correct answer: C. 1590 x 10^24 years
- A. 1590 x 10^6 years
- B. 1590 x 10^12 years
- C. 1590 x 10^24 years
- D. Never
Explanation
The time required for a substance to decay to half of its original amount is determined by its half-life. In this case, to lose all radium, it would take many times the half-life, so the correct answer is a large multiple of the half-life.
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Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
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