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A 65-kg person is accidentally exposed for 240 s to a 15-mCi source of beta radiation coming from a sample of 90Sr.
(a) What is the activity of the radiation source in disintegrations per second? In becquerels?
(b) Each beta particle has an energy of 8.75 X 10-14 J, and 7.5% of the radiation is absorbed by the person. Assuming that the absorbed radiation is spread over the person's entire body, calculate the absorbed dose in rads and in grays.
(c) If the RBE of the beta particles is 1.0, what is the effective dose in mrem and in sieverts?
(d) How does the magnitude of this dose of radiation compare with that of a mammogram (300 mrem)?
Using the volumes of sodium thiosulfate solution you just entered and the molarity of the potassium iodate primary standard solution, calculate the molarity of the sodium thiosulfate secondary standard solution for each trial.
A certain atom has a doubly degenerate ground level pair and an upper level of four degenerate states at 450 cm?1 above the ground level. In an atomic beam study of the atoms it was observed that 30 per cent of the atoms were in the upper level
The IR spectrum of HCN shows 3 absorption bands at 3312 cm^-1, 2089 cm ^-1, and 712cm^-1. From this info alone can you deduce whether HCN is linear or not? Explain.
1) Calculate the equilibrium constant at 298K for the reaction CaCO3(s) --> CaO(s) + CO2(g) delta G0 = -254.8 KJ a) 4.61 b) 4.61*10^44 c) 1.02*10^2 d) None of the above
What is the biological advantage (in KJ/mol of energy released as heat) of complete aerobic oxidation compared with anaerobic glycolysis to latic acid?
A different nonscientist is going to make a new semiconductor III-V solid. But for reasons to discussed later, the scientist is going to use tow different elements for the III-atom part,
A tank at is filled with of sulfur hexafluoride gas and of carbon monoxide gas. You can assume both gases behave as ideal gases under these conditions.
Without consulting the table of acid-dissociation constants matches the following acids to the given Ka1 values. H2S, H2SO3 and H2SO4. The values are Ka1= 1.7E-7, 1.5E-2, and Ka1 very large
The reaction caused the temperature of the solution to rise from 22.15 C to 26.78 C. If the solution has the same density and specific heat as water
question the mass of a proton is 1.007825 amu and the mass of a neutron is 1.008665 amu. what is the nuclear binding
Pre-Lab Assignment- Understanding Activity 3 in this manual and significant figures and uncertainty in measurements in general will help you answer the last two questions
The carbohydrate glyceraldehyde is shown below in several different Fischer projections. Sort the structures according to whether the Fischer projection represents glyceraldehyde
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