Two mice each eat one-third of a piece of radioactive cheese, leaving one-third behind. Forty minutes later the two mice are caught and eaten by an owl. Six hours after this meal, the owl is caught and has a total body count of 200 counts per minute, which by coincidence is the same as the remaining piece of cheese at the same time. The effective half-life for the radioactive isotope in an owl is 4.00 h and in a mouse 1 h and 20 min. a) What is the biological half-life for this isotope in a mouse? (ans=100 min) b) What was the initial count-rate for the whole piece of cheese? The diagram might help you to organize your thoughts. (ans=1200 counts per minute)

Two mice each eat one-third of a piece of radioactive cheese, leaving one-third behind. Forty minutes later the two mice are caught and eaten by an owl. Six hours after this meal, the owl is caught and has a total body count of 200 counts per minute, which by coincidence is the same as the remaining piece of cheese at the same time. The effective half-life for the radioactive isotope in an owl is 4.00 h and in a mouse 1 h and 20 min. a) What is the biological half-life for this isotope in a mouse? (ans=100 min) b) What was the initial count-rate for the whole piece of cheese? The diagram might help you to organize your thoughts. (ans=1200 counts per minute)

Similar questions

A Geiger counter reading of a radioactive sample is initially 7420 counts per minute. The same sample gives a reading of 422 counts per minute 11.0 h later. What is the sample's half-life?
You find a 37.2 g fossilized bone that has an activity of 0.024 counts per second. How old is the bone? Please give your answer in years.
A 75 kg patient swallows a 33 μCi beta emitter whose half-life is 5.0 days and whose RBE is 1.6. The beta particles are emitted with an average energy of 0.35 MeV, 90% of which is absorbed by the body. You are a health care worker needing to find the patient's dose equivalent after one week. These series of steps will help you find that dose equivalent. In all questions, assume the radioactive nuclei are distributed throughout the patient's body and are not being excreted. Part A How many radioactive nuclei did the patient swallow? Express your answer using three significant figures. ▸ View Available Hint(s) No= ΜΕ ΑΣΦ Submit ?
After 1.80 days, the activity of a sample of an unknown type radioactive material has decreased to 80.4% of the initial activity. What is the half-life of this material?
Thorium 22890Th produces a daughter nucleus that is radioactive. The daughter, in turn, produces its own radioactive daughter, and so on. This process continues until bismuth 21883Bi is reached. What are (a) the total number Nα of α particles and (b) the total number Nβ of β- particles that are generated in this series of radioactive decays?
A dose of 8.60 mCi of a radioactive isotope is injected into a patient. The isotope has a half-life of 3.0 h. How many of the isotope parents are injected?
A 95 kgkg patient swallows a 33 μCiμCi beta emitter with a half-life of 5.0 days, and the radioactive nuclei are quickly distributed throughout his body. The beta particles are emitted with an average energy of 0.35 MeVMeV, 90%% of which is absorbed by the body. What dose equivalent does the patient receive in the first week?
Please both