The RDA for the trace element selenium is 0.000070 g>day. Express this dose in mg>day.
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The RDA for the trace element
selenium is 0.000070 g>day. Express this dose in mg>day.
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- A particular radioactive source produces 100 mrad of 2-MeV gamma rays per hour at a distance of 1.0 m. (a) How long could a person stand at this distance before accumulating an intolerable dose of 1 rem? (b) Assuming the gamma radiation is emitted uniformly in all directions, at what distance would a person recieve a dose of 10 mrad/h from this source? dont provode hand written solutionCalculate the volume needed to dispense a 21 mCi dose from a Tc-99m DTPA vial containing 400 mCi in 6 ml. Answer:Inverse Square Distance of 40” = 5mR New distance = 36”, what is your new dose ___________
- 27. A shielded vial with a 1-mm thick lead shield contains Tc. If A. 11.8 mR/hr В. 23.5 mR/hr C. 47 mR/hr D. 94 mR/hr the unshielded sample yielded an exposure rate of 188 mR/hr, what will the exposure rate be from the shielded vial? (The lead HVL for Tc is 0.25 mm.) 28. If "Co gives an exposure rate of 38 R/hr at 2 m, at least how А. 2 В. 3 many HVLS of concrete shielding are required to reduce this exposure to below 2 R/hr at the same distance? (The concrete HVL for "Co is 6.2 cm.) С. 4 D. 5A Geiger counter measured the radiation in a closet and found it to be 3.6 mSv. What is this value in Sv, and is this level of radiation higher or lower than natural background radiation?If the dose rate from a sample of Ra-223 was found to be 5.0 x 10-5 mSv per hour at 1.8 metres, calculate the dose rate at 4.8 metres. Show your calculations. Give your answer to two significant figures.