Introduction To Health Physics
Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 4, Problem 4.23P
To determine

The time required for two isotopes to reach at equilibrium.

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The radioactive isotope, 14 6 C does not occur naturally but it is found at constant rate by the action of cosmic rays on the atmosphere. It is taken up by plants and animals and deposited in the body structure along with natural carbon, but this process stops at death. The charcoal from the fire pit of an ancient camp has an activity due to 146C of 12.9 disintegrations per minute, per gram of carbon. If the percentage of 146C compared with normal Carbon in living trees is 1.35 × 10−10%, the decay constant is 3.92 × 10−10 s−1 and the atomic weight = 12.0, what is the age of the campsite?
The rubidium isotope 8Rb is a ß emitter with a half life of 4.9 × 1010 y . It is used to determine the age of rocks and fossils. Rocks containing the fossils of early animals contain a ratio of Sr to Assuming that there was no when the rocks were formed, calculate the age of these fossils. Answer in units of y. that decays into 87Sr. 87 Rb of 0.02. 87 Sr present
(a) What is the ratio of the radii of the nuclei Ni-58 and N-15? (b) What is the ratio of the densities of these nuclei? OA: 1.570 OB: 1.836 OC: 2.149 OD: 2.514 OE: 2.941 OF: 3.441 OG: 4.026 OH: 4.711 OA: 0.2 OB: 0.3 OC: 0.3 OD: 0.4 OE: 0.5 OF: 0.6 OG: 0.8 OH: 1.0
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