A sample of radioisotope has a decay constant of 9.978✕10-7 s-1 and prepared with an initial activity of 7.5✕1012 s-1. Find the number of atoms in the sample after 10 days.
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A sample of radioisotope has a decay constant of 9.978✕10-7 s-1 and prepared with an initial activity of 7.5✕1012 s-1. Find the number of atoms in the sample after 10 days.
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- Gamma rays may be used to kill pathogens in ground beef. One irradiation facility uses a 60Co source that has an activity of 1.0×10^6Ci. 60Co undergoes beta decay and then gives off two gamma rays, at 1.17 and 1.33MeV; typically 30% of this gamma-ray energy is absorbed by the meat. The dose required to kill all pathogens present in the beef is 4000Gy. How many kilograms of meat per hour can be processed in this facility? Express your answer in kilograms per hA building has become accidentally contaminated with radioactivity. The longest-lived material in the building is strontium-90. (The atomic mass of 90/38 Sr is 89.9077 u.) If the building initially contained 8.6 kg of this substance and the safe level is less than 10.4 counts/min, how long will the building be unsafe? Provide answer in number of years.A certain isotope has a half-life of 5.9 h and an atomic mass of 95.98 u. What will the activity in Bq of a 1.36-g sample be after 19.8 h?
- In many cases, prostate cancer is treated by implanting 60 to 100 small seeds of radioactive material into the tumor. The energy released from the decays kills the tumor. One isotope that is used (there are others) is palladium (103Pd) with a half-life of 17 days. If a typical grain contain 0.27 g of 103Pd, (a) what is its initial activity in Bq and (b) what is the activity 68 days later?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.It is known that the initial number of atoms in a radioactive sample is No = 4.0 x 108 atoms. If the the half life of the sample is measured to be 6 days, what is the initial activity R0 of the sample? units in Bq
- Find the activity of a sample containing 1.63 10-6 g of (60/27)Co (T1/2 = 5.27 years).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?Chromium's radioactive isotope 51Cr has a half-life of 27.7 days and is often used in nuclear medicine as a diagnostic tracer in blood studies. Suppose a 51Cr sample has an activity of 2.36 µCi when it is placed on a storage shelf. (a) How many 51Cr nuclei does the sample contain? Answer:__________ nuclei (b) Calculate the sample's activity in Bq when it is removed from storage one year later. Answer:____________Bq
- Find the activity of a sample Containing 701X 1019 10aine-131 nuciei (T1/2=8.0 days).The radioisotope Tc is an isotope that sometimes given to patients because it emits gamma rays and has a relatively short half-life of 6.05 h. Because emits gamma rays, 43 can be used as a tracer when performing imaging on a specific part of the human body. (a) Find the decay constant of "Tc (in h-l). h-1 (b) Find the number of Tc nuclei needed to provide an activity of 2.61 pCi. nuclei