The C14 with an activity of 10 Ci is in a 1.0 mm thick lead box. Calculate the number of beta particles per second at just outside of the box
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The C14 with an activity of 10 Ci is in a 1.0 mm thick lead box. Calculate the number of beta particles per second at just outside of the box.
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- 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% .)The radionuclide 32P (T1/2 = 14.28 d) is often used as a tracer to follow the course of biochemical reactions involving phosphorus. (a) If the counting rate in a particular experimental setup is initially 3050 counts/s, how much time will the rate take to fall to 170 counts/s? (b) A solution containing 32P is fed to the root system of an experimental tomato plant, and the 32P activity in a leaf is measured 3.48 days later. By what factor must this reading be multiplied to correct for the decay that has occurred since the experiment began?4. 500 mCi sample of radioisotope was purchased by a medical supply house. If the sample has the half-life of 15 days. How long will it keep before it's activity is reduced to 25 mCi ?
- A dose-response curve is generally shaped as a(n) __________.A.inverted VB.SC.inverted UD.U✓ ON "O 2.75 MeV 0.511 MeV 0.511 MeV B, E= 1.73 MeV Eave = 0.721 Mev O MeVA 228Th source is labeled 1.50 mCi, but its present activity is found to be 1.73 ✕ 106 Bq. A.) What is the present activity in mCi? =______mCi B.) How long ago did it actually have a 1.50-mCi activity? =_____y
- The remnants of an ancient fire in a cave in Africa showed a 1C decay rate of 3.9 counts per minute per gram of carbon. If the decay rate in C-14 in freshly cut wood, is 13.6 counts per minute per gram of carbon, how many years ago did the campfire occur?Ir-192 source used in the brachytherapy unit has an activity of 468.20 GBq as of January 22, 2022. When is the expected date of brachytherapy source exchange given that the minimum activity for the source to be in its optimal use is 1 Ci? The half-life of Ir-192 is 73.83 days.The alpha ray activity of a material is measured after equal successive inter-vals (hours), in terms of its initial activity as unity to the 0.835; 0.695; 0.580; 0.485; 0.405 and 0.335. Assuming that the activity obeys an exponential decay law, find the equation that best represents the activity and calculate the decay constant and the half-life.??????