Calculate the activity of these samples at the given times: 2.2 mCi Tl-201 (t₁/2 = 73.1 hours) at 22 hrs before calibration 25 μCi Tc-99m at 12 hours before calibration 10 mCi F-18 at 3.5 hours before calibration

The radionuclide 49Sc has a half-life of 57.0 min.At t=0, the counting rate of a sample of it is 6000 counts/min above the general background activity, which is 30 counts/min.Without computation, determine whether the counting rate of the sample will be about equal to the background rate in 3 h, 7 h, 10 h, or a time much longer than 10 h.

QUESTION 13 The following table of probabilistic time estimates (in weeks) and activity predecessors are provided for a project Immediate Most Probable Predecessor Activity A B C D E F G H Table 1 Reference: Ref 1 A, B B C D, E F Optimistic Time Time 11 13 5 13 6 3 4 6 2 3 10 5 6 8 4 13 Using Table 1, the earliest start time for activity G is OA. 0.0 weeks. OB. 10.0 weeks. O C. 10.5 weeks. O D. 15.5 weeks. O E. None of the above Pessimistic Time 14 19 14 7 11 13 6 9 decessors are p

Experimentally, it is found that natural potassium emits 31 beta particles per second per gram and 3.4 gamma rays per second per gram. With this data, determine the half- life period of K40. (The isotopic concentration of K40 is 0.0118% .)

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A radiation worker stands 50 cm away from a radioactive source of 25 mCi 57Co. Calculate the exposure value received by the worker while standing for 1 hr near the source. The isotop half-life is 271.8 days. can you use the formulas from the pictures please? thank you

A 0.025 nm X-ray source deposits 30 million photons into 10 grams of tissue. What is the absorbed dose in the tissue (in Gy)? What is the dose equivalent (in Sv)?

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 solution

Find the activity of a sample containing 1.63  10-6 g of (60/27)Co  (T1/2 = 5.27 years).

Find the activity of a sample Containing 701X 1019 10aine-131 nuciei (T1/2=8.0 days).