Modern Physics
3rd Edition
ISBN: 9781111794378
Author: Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Publisher: Cengage Learning
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Chapter 14, Problem 51P
To determine
The worker who receives larger dose in rad.
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Sihle, an archaeologist from UWC finds an ancient wooden axe handle at an excavation site at Onderstepoort. He wants to determine the age of the axe handle. He takes a small sample of carbon from the axe handle and places it near a Geiger counter. The counter reads 5 counts/minute. He then takes the same mass of carbon from a living tree and finds that it has a count-rate of 40 counts/minute. a) How old is the axe handle? (assume the half-life of C-14 is about 6000 years) - choose answer below b) Explain your reasoning in 'Rationale'
A. 6000 years
B. 2000 years
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Monique, an archaeologist from UWC finds an ancient wooden axe handle at an excavation site at Onderstepoort. She wants to determine the age of the axe handle. She takes a small sample of carbon from the axe handle and places it near a Geiger counter. The counter reads 20 counts/minute. She then takes the same mass of carbon from a living tree and finds that it has a count-rate of 40 counts/minute. a) How old is the axe handle? (assume the half-life of C-14 is about 6000 years) - choose answer below b) Explain your reasoning in 'Rationale'
An x - ray technician works 5 days per week, 50 weeks per year. Assume the technician takes an average of eight x - rays per day and receives a dose of 5.0 rem/yr as a result. (a) Estimate the dose in rem per x - ray taken. (b) How does this result compare with the amount of low - level background radiation the technician is exposed to?
Chapter 14 Solutions
Modern Physics
Ch. 14 - Prob. 1QCh. 14 - Prob. 2QCh. 14 - Prob. 3QCh. 14 - Prob. 4QCh. 14 - Prob. 5QCh. 14 - Prob. 7QCh. 14 - Prob. 8QCh. 14 - Prob. 9QCh. 14 - Prob. 10QCh. 14 - Prob. 11Q
Ch. 14 - Prob. 12QCh. 14 - Prob. 14QCh. 14 - Prob. 15QCh. 14 - Prob. 1PCh. 14 - Prob. 2PCh. 14 - Prob. 3PCh. 14 - Prob. 4PCh. 14 - Prob. 5PCh. 14 - Prob. 6PCh. 14 - Prob. 7PCh. 14 - Prob. 8PCh. 14 - Prob. 9PCh. 14 - Prob. 10PCh. 14 - Prob. 11PCh. 14 - Prob. 12PCh. 14 - The atomic weight of cadmium is 112.41, and its...Ch. 14 - Prob. 15PCh. 14 - Prob. 16PCh. 14 - Prob. 17PCh. 14 - Prob. 19PCh. 14 - Prob. 20PCh. 14 - Prob. 21PCh. 14 - Prob. 22PCh. 14 - Prob. 23PCh. 14 - Prob. 24PCh. 14 - Prob. 25PCh. 14 - Prob. 27PCh. 14 - Prob. 28PCh. 14 - Prob. 29PCh. 14 - Prob. 30PCh. 14 - Prob. 31PCh. 14 - Prob. 32PCh. 14 - Prob. 33PCh. 14 - Prob. 34PCh. 14 - Prob. 35PCh. 14 - Prob. 36PCh. 14 - Prob. 37PCh. 14 - Prob. 38PCh. 14 - Prob. 39PCh. 14 - Prob. 40PCh. 14 - Prob. 41PCh. 14 - Prob. 42PCh. 14 - Prob. 43PCh. 14 - Prob. 45PCh. 14 - Prob. 46PCh. 14 - Prob. 47PCh. 14 - Prob. 48PCh. 14 - Prob. 49PCh. 14 - Prob. 50PCh. 14 - Prob. 51PCh. 14 - Prob. 52PCh. 14 - Prob. 53PCh. 14 - Prob. 54PCh. 14 - Prob. 55PCh. 14 - Prob. 56PCh. 14 - Prob. 57PCh. 14 - Prob. 58PCh. 14 - Prob. 59PCh. 14 - Prob. 60P
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- Calculate the dose in Sv to the chest at a patient given an xray under the following conditions. The xray beam intensity is 1.50 W/m2, the area of the chest exposed is 0.0750 m2 35.0% of the xrays are absorbed in 20.0 kg of tissue, and the exposure time is 0.250 s.arrow_forwardWhat is the dose in mSv for: (a) a 0.1 Gy xray? (b) 2.5 mGy of neutron exposure to the eye? (c) 1.5 mGy of exposure?arrow_forward(a) A cancer patient is exposed to rays from a 5000Ci 60Co transillumination unit for 32.0 s. The rays are collimated in such a manner that only 1.00% of them strike the patient. Of those, 20.0% are absorbed in a tumor having a mass of 1.50 kg. What is the dose in rem to the tumor, it the average energy per decay is 1.25 MeV? None of the s from the decay reach the patient. (b) Is the dose consistent with stated therapeutic doses?arrow_forward
- In 1991, two hikers in the Alps, between Italy and Austria, discovered the remains of a well-preserved mummy that dates back to the Ice Age. The activity of C-14 in the remains of the Iceman was measured to be 0.1222 Bq per gram. In a living organism the rate of radioactive decay of C-14 is 0.2310 Bq per gram. Determine how long ago the Iceman lived. The half-life of C-14 is 5730 years. (in yr) OA: 2528 OB: 2857 oC: 3228 OD: 3648 E: 4122 OF: 4658 OG: 5264 OH: 5948arrow_forwardIn 1991, two hikers in the Alps, between Italy and Austria, discovered the remains of a well-preserved mummy that dates back to the Ice Age. The activity of C-14 in the remains of the Iceman was measured to be 0.1220 Bq per gram. In a living organism the rate of radioactive decay of C-14 is 0.2310 Bq per gram. Determine how long ago the Iceman lived. The half-life of C-14 is 5730 years. (in yr) OA: 1732 OB: 2511 OC: 3641 OD: 5280 OE: 7655 OF: 11100 OG: 16095 OH: 23338arrow_forwardAn x-ray technician works 5 days per week, 50 weeks per year. (Assume that the technician takes an average of six x-rays per day and receives a dose of 4.1 rem/yr as a result.) (a) Estimate the dose in rem per x-ray taken. (b) How does this result compare with the amount of low-level background radiation the technician is exposed to? Assume that low-level radiation from natural sources, such as cosmic rays and radioactive rocks and soil, delivers a dose of approximately 0.13 rem/year per person. __________times the normal background levelarrow_forward
- Sihle, an archaeologist from UWC finds an ancient wooden axe handle at an excavation site at Onderstepoort. He wants to determine the age of the axe handle. He takes a small sample of carbon from the axe handle and places it near a Geiger es counter. The counter reads 5 counts/minute. He then takes the same mass of carbon from a living tree and finds that it has a count-rate of 40 counts/minute. a) How old is the axe handle? (assume the half-life of C-14 is about 6000 years) - choose tion answer below b) Explain your reasoning in 'Rationale' A. 18 000 years B. 12 000 years OC. 2000 years D. 6000 years Rationale:arrow_forwardAssume that a full CT scan of the spinal cord (columna vertebralis) of a patient delivers an equivalent dose of 10 mSv to the patient. Further assume that the energy of the X-rays is 100 keV and that on average 50% of the energy is deposited in the patient. Calculate the total number of X rays necessary to deliver this dose to the patient.arrow_forwardA small region of a cancer patient’s brain is exposed for 24.0 min to 475 Bq of radioactivity from 60Co for treatment of a tumor. If the brain mass exposed is 1.858 g and eachβ- particle emitted has an energy of 5.05x10-14 J, what is the dose in rads?arrow_forward
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