An old wooden tool, containing 120.0 grams of carbon, is found in an ancient tomb. The tool emits 812 electrons/minute from the beta decay of 14 C. How old is the wood from which the tool was constructed? Given: The half-life of "C is 5730 years, the ratio of 4C to 12C in living plants is 1.30 x 1012, 1 year = 3.15576 x 10' s, N, = 6.0221415 x 102 atoms/gram-mole.
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An old wooden tool, containing 120.0 grams of carbon, is found in an ancient tomb. The tool emits 812
electrons/minute from the beta decay of 14 6 C. How old is the wood from which the tool was constructed?
Given: The half-life of 14 6 C is 5730 years, the ratio of 146C to 126C in living plants is 1.30 x 10-12, 1 year =
3.15576 x 107 s, NA = 6.0221415 x 1023 atoms/gram-mole.
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- A piece of charcoal (totally carbon) from an ancient campsite has a mass of 262 grams. It is measured to have an activity of 29 Bq from 14C decay. Use this information to determine the age of the campfire. Your answer is required to be in years. Information: 14C half-life is 5730 years. 1 gram of living carbon has 6.52x1010 atoms of 14CA patient receives a dose of radiation by ingesting a radioactive medication containing 32P, which emits B rays with an RBE of 1.5. The energy of each emitted B is 705 keV. The half-life of 32p is 14.28 days, and the initial activity of the medication is 1.34 MBq. What is the absorbed dosage (in rad) over a period of 7.00 days, assuming the radiation is absorbed by 125 g tumor? (Recall that 1 Ci = 3.7 x 1010 Bg) 62 230 93 153 98The remains of an ancient cave were unearthed. Analysis from charcoal in the cave gave 12.0 disintegration/min/g of carbon. The half life of C-14 is 5730 years. Analysis of the tree cut down when the cave was unearth showed 22.1 disintegrations/min/g of carbon. How old are the remains in the cave?
- You have a sample of unknown medication that is radioactive. You believe you should be able to identify the medication if you can deduce its half-life. You measure its initial activity as 2.30e+06 Bq. 10.4 hours later you measure its activity as 8.10e+05 Bq. a) What is the half-life of this unknown sample? hour b) How many nuclides are present when the activity is 8.10e+05 Bq?Archeologist extracted 179 gm of carbon from an animal bone from an archeological site. The carbon shows an activity of 15 decays/s. (Half-life of 146C = 5730 years, 1 year = 3.156 x 107 seconds, Avogadro's number = 6.02 x 1023 atoms/mol) (A) Total number of atoms in this carbon sample = . (B) Decay constant of 146C, λ = . (C) Number of 146C atoms in this sample = . (D) Activity of 146C at time (t = 0) = . (E) Age of the animal =(a) At an initial time, a radioactive sample has an activity of 8.77x104 Bq. After 3.88 hours the activity is 5.35x104 Bq. (A) What is the half-life of the isotope? (B) What is the activity after an additional 3.88 hours? (A) (in s) OA: 6.426x103 OB: 9.317x103 oC: 1.351x104 OD: 1.959x104 OE: 2.840x104 OF: 4.119x104 OG: 5.972x104 (B) (in Bq) H: 8.660x104 OA: 1.387x104 OB: 1.845x104 OC: 2.454x104 OD: 3.264x104 OE: 4.341x104 OF: 5.773x104 OG: 7.678x104 OH: 1.021x105
- A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 1.19 kg sample of carbon from the wood has an activity of 2340 decays per minute. Find the age of the charcoal. Living mate- rial has an activity of 15 decays/minute per gram of carbon present and the half-life of 14C is 5730 y. Answer in units of y.The nucleus of a fictitious element consists of 15 protons and 16 neutrons. The mass of the respective atom is 31.021 u. Calculate the nuclear binding energy per nucleon, in MeV. The mass of the hydrogen atom is 1.007825 u, the mass of the neutron is 1.008665 u.A 60-kg person accidentally ingests a small source of alpha particles ( RBE=15). The activity of the source is 0.04 Ci, the half-life of the source is 110 years, and each alpha particle emitted has an energy of 0.586 MeV. It takes 12hours for the alpha source to pass through the person's digestive system and exit the body. a). How many alpha particles are absorbed by the person ( assume that 100 percent of the alpha particles emitted by the source are absorbed by the person)? b). How many energy, in Joules, is deposited in the person by the source? c). What is the absorbed dose in rad? d). What is the absorbed dose in rem?
- The decay chain of uranium includes radon, a noble gas. When uranium in the soil decays to radon, it may seep into houses; this can be a significant source of radiation exposure. Most of the exposure comes from the decay products of radon, but some comes from alpha decay of the radon itself. If radon in the air in your home is at the maximum permissible level, the gas in your lungs will have an activity of about 0.22 Bq. Each decay generates an alpha particle with 5.5 MeV of energy, and essentially all that energy is deposited in lung tissue. Part A Over the course of 1 year, what will be the dose equivalent in Sv to the approximately 0.90 kg mass of your lungs? Express your answer in millisieverts per year. ΕΧΕΙ ΑΣΦ dose equivalent = ? mSv/yrYou measure the decay rate of a radioactive sample to be 4.225e11 Bq. After 139 s, the decay rate is a quarter the initial rate. a) what is the half-life of the sample? b) how many nuclei were in the sample initially?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.??????