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 11, Problem 11.14P
To determine
To Find: The minimum ventilation rate of Krypton gas needed for the steady state concentration of a room.
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Iodine-131 is a beta-emitter, which decay by the first-order rate law with a half-life of 8.0 days. What is the activity in cps (counts per second) of 25.0 ng (2.5 x 10–8 g) sample of 131I (atomic mass = 131 g/mol)? (Avogadro’s #, NA = 6.02 x 1023/mol)
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- The Q-value of a reaction is the amount of energy released during the reaction. It is stated thatin step 1 of the PPI thermonuclear reaction chain,1H +1H → 2H + e+ + ν,1.44 MeV energy is released; then in step 2: 2H + 1H → 3He + γ and step 3,3He + 3He → 4He + 1H + 1H, 5.5 MeV and 12.8 MeV are released, respectively. Prove byappropriate calculation that the above quoted Q-values in MeV are true. The relevant masses:hydrogen 1.00782503214, helium-4 4.002603, positron 0.00054857991, deuterium 2.0141 andhelium-3 3.0160 are all quoted in the atomic units of mass which is 1.6605387 × 10−27 kg. Ignorethe neutrino contribution.arrow_forwardTo minimize neutron leakage from a reactor, the ratio of the surface area to the volume should be a minimum. For a given volume V, calculate this ratio for (a) a sphere, (b) a cube, and (c) a parallelepiped of dimensions a x a x 2a. (d) Which of these shapes would have minimum leakage? Which would have maximum leakage? Explain your answers.arrow_forwardUsing the ideal gas equation, calculate the density of radon gas at 8.0 K and 9.0 atm, Give your answer in g/L and do not use scientific notation.arrow_forward
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