1. Cobalt-60 is often used as a radioactive source in medical physics. It has a half-life of 5.25 years. Calculate how long after a new sample is delivered the activity will have to decreased to one-eighth of its value when delivered.
2. The half-life of a radioactive isotope of sodium used in medicine is 15 hours.
(a) Determine the decay constant for this nuclide.
(b) A small volume of a solution containing this nuclide has an activity of 12000 disintegrations per minute when it is injected into the bloodstreams of a patients. After 30 hours, the activity of 1.0 cm^3 of blood taken from the patient is 0.50 disintegrations per minute. Estimate the volume of blood in the patient, Assume that the solution is uniformly diluted in the blood, that it is not taken up by the body tissues, and that there is no less by excretion.
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2. The half-life of a radioactive isotope of sodium used in medicine is 15 hours.
(a) Determine the decay constant for this nuclide.
(b) A small volume of a solution containing this nuclide has an activity of 12000 disintegrations per minute when it is injected into the bloodstreams of a patients. After 30 hours, the activity of 1.0 cm^3 of blood taken from the patient is 0.50 disintegrations per minute. Estimate the volume of blood in the patient, Assume that the solution is uniformly diluted in the blood, that it is not taken up by the body tissues, and that there is no less by excretion.
I waiting. THANKS! =)