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5. Explain how you might use radioactive Fe-59 (a beta emitter with t1/2=44.5 days) to determine the extent to which rabbits are able to convert a particular iron compound in their diet into blood hemoglobin, which contains iron atoms. (10)

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་ Part A 131 I undergoes beta-minus decay with a subsequent gamma emission from the daughter nucleus. Iodine in the body is almost entirely taken up by the thyroid gland, so a gamma scan using this isotope will show a bright area corresponding to the thyroid gland with the surrounding tissue appearing dark. Because the isotope is concentrated in the gland, so is the radiation dose, most of which results from the beta emission. In a typical procedure, a patient receives 0.050 mCi of 131I. Assume that all of the iodine is absorbed by the 0.15 kg thyroid gland. Each 131 I decay produces a 0.97 MeV beta particle. Assume that half the energy of each beta particle is deposited in the gland. What dose equivalent in Sv will the gland receive in the first hour? Express your answer with the appropriate units. HÅ Units Dose equivalent = Value Submit Request Answer ?
Question 1: The table shows two isotopes of potassium and two isotopes of calcium. 39K 39 Ca Stable ß* decay 38.96371 38.9707 Type of emission Mass of neutral atom / u Number of electrons Number of protons Number of neutrons Total mass/u Mass defect / u Binding energy / J 42K ß decay 41.9624 Mass of the neutron = 1.008665 u 19 19 ta min 23 42.34797 0.38557 5.76 x 10-11 2 051 oqque 42 Ca stable 41.95863 Mass of the electron = 0.000549 u Mass of the proton = 1.007276 url millons voled pringle bre noljenimaxe al prderobny v nollenimexe erit lo anpitibnco art di ballamos svar en talean blow tert elshatem vos maxe erii otni triquonion aver a) Use data about potassium-42 to explain the concept of mass defect. oo will teanu snimaxe edt sot jaqeq maxe eft overmat ym of 820308 ever b) Complete the table and to calculate the mass defect and binding energy of 39K. Show your calculations in the space below.
Suppose that you want to find out how much gasoline is in an underground storage tank. You pour in 1 gallon of gasoline that contains some radioactive material with a long half-life that gives off 5000 counts per minute. The next day, you remove a gallon from the underground tank and measure its radioactivity to be 10 counts per minute. How much gasoline is in the tank?
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