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Saj 4@\Or\ӲAl?8)'fqr_a]]VS*z=/MJJAqT8| c]ǻ 6 Radiation : 6 10CFR20 (Standards for Protection against Radiation) alpha & beta particles, gamma rays, X-rays, neutrons, high-speed electrons, high-speed protons, other atomic particles capable of producing ion. (Radiation, as used in this regulation, does not include non-ionizing radiation, such as radio- or microwaves, or visible, infrared, or ultraviolet light.) 6 eЂ ab w ia, a, a, Aa, a a帳a, a, qa Ba, 5e aa w Aᐡi a a 6 Radioactivity : The emission of radiation by spontaneous nuclear transformation, or property of emitting radiation by spontaneous nuclear transformation. b) transformation constant and half-life (10 points) <Solution> 6 Transformation constant (5) : The rate of spontaneous nuclear transformation of nuclide A is proportional to the number of nuclei A : (where, N = number of nuclei A, 5= Transformation constant). The unit of this constant is sec-1, min-1 or hr-1, etc. Similarly, the term of decay constant or disintegration constant is used instead of this constant. 6 Half-life (T6 = ln2 /5) : The time required to transform to one half of the original number of nuclei. Problem 2 (20 points) : Find the followings when a 1D6 flask is filled with pure 222Rn (T1/2 = 3.82 days) gas. Assume the temperature is 20)4 and the pressure is 76 mmHg). a) transformation constant of 222Rn (5 points) <Solution> b) number of nuclei per liter of pure 222Rn (5 points) <Solution> The amount of 222Rn in the flask in moles becomes : X moles/D6 : 76 mmHg = 1 mole/22.4D6 : 760mmHg c) activity of 222Rn in curies (5 points) <Solution> d) activity of 222Rn in curies after 5 days cooling (5 points) <Solution> Problem 3 (20 points) : Calculate the equilibrium concentration of 222Rn (T1/2 = 3.82 days) in a sealed room of 500I6 where 1 Ci of 226Ra (T1/2 = 1,620 yrs) is stored. Find the ventilation exhaust rate (I6/hour) in order to keep the concentration of 222Rn in the room under 4410-6 Ci/I6. D_