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The activity of a sample of a radioisotope at some time is 10.9 mCi and 0.46...
A freshly prepared sample of a radioactive isotope has an activity of 27.5 mCi. After 2.60 hours, the activity is 21.0 mCi. (a) Determine the half-life of the isotope. (h) (b) How many nuclei of the isotope were contained in the freshly prepared sample? (nuclei) (c) After how much time will the activity be 1.40 mCi? (h)
A freshly prepared sample of a certain radioactive isotope has an activity of 10.0 mCi. After 3.80 h, the activity is 8.30 mCi. (a) Find the decay constant and half-life of the isotope. (b) How many atoms of the isotope were contained in the freshly prepared sample? (c) What is the sample's activity 30 h after it is prepared?
The initial activity of a sample of the cesium isotope 137Cs is 120 mCi . When delivered to a hospital 13 hours later, its activity is 95 mCi. a.)What is the isotope's half life? th=___________ h b.)If the minimum usable activity is 10mCi, how long after delivery at the hospital is the sample usable? t=__________h
The half-life of 131I is 8.04 days. (a) Convert the half-life to seconds. s (b) Calculate the decay constant for this isotope. s−1 (c) Convert 0.650 μCi to the SI unit the becquerel. Bq (d) Find the number of 131I nuclei necessary to produce a sample with an activity of 0.650 μCi. 131I nuclei (e) Suppose the activity of a certain 131I sample is 7.10 mCi at a given time. Find the number of half-lives the sample goes through in...
The radioisotope sodium-24, half-life 15 h, is used to measure the flow rate of salt water by irradiation of stable ?? with neutrons, suppose that we produce 5 micrograms of the isotope. How long after a sample is placed in a reactor is it before the sample activity reaches 75% of the maximum activity? Assume the production of a single reactive species at a constant rate R sec-1, the decay rate λ, and there is no initial activity in the...
The activity of a sample of the cesium isotope 137Cs is 150mCi . When delivered to a hospital 14 hours later, its activity is 95 mCi. What is the isotope's half life? If the minimum usable activity is 10 {\rm mCi}, how long after delivery at the hospital is the sample usable?
The half-life of 52Mn is 5.59 days. (a) Convert the half-life to units of seconds. (b) What is the decay constant (in s−1) for this isotope? (c) Suppose a sample of 52Mn has an activity of 0.510 µCi. What is this activity expressed in the SI unit of becquerels (Bq)? (d) How many 52Mn nuclei are needed in the sample in part (c) to have the activity of 0.510 µCi? E. Now suppose that a new sample of 52Mn has...
The half-life of 131I is 8.04 days. (a) Convert the half-life to seconds. (b) Calculate the decay constant for this isotope. (c) Convert 0.350 μCi to the SI unit the becquerel. (d) Find the number of 131I nuclei necessary to produce a sample with an activity of 0.350 μCi. (e) Suppose the activity of a certain 131I sample is 6.10 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity...
Thanks! 1. At time t = 0, a sample of radioisotope Physiconium has activity 4096 counts/second (Bq) and half-life 30 minutes. What is the expected activity after 2 hours, in becquerel? 2. High energy protons are used for some special radiation therapy situations. The protons have mean energy = 1 MeV, and 4 million particles are absorbed a region of the brain which has mass 0.1 kg. Find the absorbed dose for the brain region, in milligray. 1 eV =...
Determine the decay rate for a radioisotope sample with an activity of 12 microcuries. [1 curie = 3.7 * 1010 disintegrations/s] Multiple Choice o 4.8*105,5 O 42*1051 O 4.4 x 1051 None of the above 4.6 x 1051