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Physics, Radiological Physics
Year 2
Radioactive decay
Radioactice substances decay exponentially. The amount of radium present at an time t obeys the law Q(t)= Qoe^-kt, where Qo. is the initial amount present and k is a suitable positive constant. The half-life of a radioactive substance is the time required for a given amount to be reduced by one-half. Now, it is known that the half-life of radium is approximately 1600 years. Suppose initially there are 200 miligrams of pure radium. Find the amount left after t years. What is the amount left after 800 years?
By OTA: Suraj Joshi, PhD (IP)
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Isotopes and Radioactive Decay. Calculate the total radioactivity that results from one isotope in the human body. Must understand the concepts of half-life, decay constant, DPM, decay. - K40 (half-life=1.3x10E9 years) composes approximately 0.012% of the potassium found in nature. By weight, the human body is approximately 0.35% potassium. Calculate the total radioactivity that results from K...
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