Essential University Physics (3rd Edition)
3rd Edition
ISBN: 9780134202709
Author: Richard Wolfson
Publisher: PEARSON
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Chapter 38, Problem 52P
To determine
The amount of Cobalt-60 used to make a laboratory source whose activity will exceed
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A scientist is studying a 2.234 g sample of thorium-229 (t1/2 = 7340 yrs) in a laboratory.
(a) What is its activity in Bq?
Answer: x 10^ Bq
(b) What is its activity in Ci?
Answer: x 10^ Ci
40.22 Iodine-120 has a half life of 1.35
hours. If you start off with a sample which
has an activity of 1.0 Ci, how long is it be-
fore the activity drops to the following val-
ues (note: you can answer these ques-
tions without using Equation (40.12)):
(а) 0.50 Ci
(b) 0.125 Ci
(c) 9.77 x 10-4 Ci
(d) 9.31 x 10-10 Ci
What is the specific activity (in Bq/g) if 8.58 µg of
an isotope emits 7.4x104 a particles per minute?
Chapter 38 Solutions
Essential University Physics (3rd Edition)
Ch. 38.1 - Prob. 38.1GICh. 38.2 - Prob. 38.2GICh. 38.3 - Prob. 38.3GICh. 38.4 - Prob. 38.4GICh. 38.5 - Prob. 38.5GICh. 38 - Prob. 1FTDCh. 38 - Prob. 2FTDCh. 38 - Prob. 3FTDCh. 38 - Prob. 4FTDCh. 38 - Prob. 5FTD
Ch. 38 - Why are iodine-131 and strontium-90 particularly...Ch. 38 - Prob. 7FTDCh. 38 - Prob. 8FTDCh. 38 - Prob. 9FTDCh. 38 - Prob. 10FTDCh. 38 - Prob. 11FTDCh. 38 - Prob. 12FTDCh. 38 - Prob. 13FTDCh. 38 - Prob. 14FTDCh. 38 - Explain the different approaches to the Lawson...Ch. 38 - Prob. 16FTDCh. 38 - Three radon isotopes have 125, 134, and 136...Ch. 38 - Prob. 18ECh. 38 - Prob. 19ECh. 38 - Prob. 20ECh. 38 - Prob. 21ECh. 38 - How many half-lives will it take for the activity...Ch. 38 - Prob. 23ECh. 38 - Prob. 24ECh. 38 - Prob. 25ECh. 38 - Prob. 26ECh. 38 - Prob. 27ECh. 38 - Prob. 28ECh. 38 - Use Fig. 38.9 to estimate the mass defect in...Ch. 38 - Find the total binding energy of oxygen-16, given...Ch. 38 - Determine the nuclear mass of nickel-60, given...Ch. 38 - Prob. 32ECh. 38 - Prob. 33ECh. 38 - Prob. 34ECh. 38 - Prob. 35ECh. 38 - Prob. 36ECh. 38 - Prob. 37ECh. 38 - Prob. 38ECh. 38 - Prob. 39ECh. 38 - Prob. 40ECh. 38 - Prob. 41ECh. 38 - Prob. 42PCh. 38 - Prob. 43PCh. 38 - Prob. 44PCh. 38 - Iron-56, with nuclear mass 55.9206 u, is among the...Ch. 38 - Prob. 46PCh. 38 - As a geologist, youre assessing the feasibility of...Ch. 38 - Prob. 48PCh. 38 - Prob. 49PCh. 38 - Nitrogen-13 is a 9.97-min-half-lifc isotope used...Ch. 38 - Prob. 51PCh. 38 - Prob. 52PCh. 38 - Prob. 53PCh. 38 - Prob. 54PCh. 38 - The table below lists reported levels of...Ch. 38 - Prob. 56PCh. 38 - Analysis of a Moon rock shows that 82% of its...Ch. 38 - Prob. 58PCh. 38 - Prob. 59PCh. 38 - Today, uranium-235 comprises only 0.72% of natural...Ch. 38 - Prob. 61PCh. 38 - Prob. 62PCh. 38 - Prob. 63PCh. 38 - Prob. 64PCh. 38 - Prob. 65PCh. 38 - Prob. 66PCh. 38 - Prob. 67PCh. 38 - Prob. 68PCh. 38 - Prob. 69PCh. 38 - Prob. 70PCh. 38 - Prob. 71PCh. 38 - Prob. 72PCh. 38 - Prob. 73PCh. 38 - Prob. 74PCh. 38 - Bismuth-209 and chromium-54 combine to form a...Ch. 38 - Prob. 76PCh. 38 - Prob. 77PCh. 38 - Prob. 78PCh. 38 - Prob. 79PCh. 38 - Prob. 80PCh. 38 - Prob. 81PCh. 38 - Prob. 82PCh. 38 - Prob. 83PCh. 38 - Prob. 84PCh. 38 - Prob. 85PCh. 38 - Prob. 86PPCh. 38 - Prob. 87PPCh. 38 - Prob. 88PPCh. 38 - Prob. 89PP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- 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_forwardData from the appendices and the periodic table may be needed for these problems. Show that the activity of the 14C in 1.00 g of 12C found in living tissue is 0.250 Bq.arrow_forwardA beam of 168MeV nitrogen nuclei is used for cancer therapy. If this beam is directed onto a 0.200kg tumor and gives it a 2.00Sv dose, how many nitrogen nuclei were stopped? (Use an RBE of 20 for heavy ions.)arrow_forward
- Data from the appendices and the periodic table may be needed for these problems. A 60Co source is labeled 4.00 mCi, but its present activity is found to be 1.85107Bq. (a) What is the present activity in mCi? (b) How long ago did it actually have a 4.00—mCi activity?arrow_forwardIf a 1.50cmthick piece of lead can absorb 90.0% of the rays from a radioactive source, how many centimeters of lead are needed to absorb all but 0.100% of the rays?arrow_forwardHow many Gy of exposure is needed to give a cancerous tumor a dose of 40 Sv if it is exposed to a activity?arrow_forward
- The charred bones of a sloth in a cave in Chile represent the earliest evidence of human presence at the southern tip of South America. A sample of the bone has a specific activity of 5.22 disintegrations per minute per gram of carbon (d/min*g). If the 12Cy14C ratio for living organisms results in a specific activity of 15.3 d/min*g, how old are the bones (t1/2 of 14C = 5730 yr)?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 atumor. If the brain mass exposed is 1.858 g and β⁻ each particle emitted has an energy of 5.05X10⁻¹⁴J, what is the dose in rads?arrow_forwardYou are an archaeologist, and send some leather clothing found at a burial site to be radiocarbon dated. Based on other clues, you think that the leather should be 500 years old. What activity ought to come back from the lab, in Bq per gram of carbon? (These sorts of checks are important in science.) The base carbon-14 activity is 0.231 Bq per gram of carbon, and the decay constant of carbon-14 is 1.21x10-4 1/year. Your Answer: Answerarrow_forward
- A 70-kg person experiences a whole-body exposure to alpha radiation (RBE=15) with energy 4.77 MeV. A total of 6.25×1012 alpha particles are absorbed. iWhat is the absorbed dose in rad? What is the equivalent dose in rem? If the source is 0.0320 gram of Radium-226 (half-life 1,600 years) somewhere in the body, what is the activity of this source? If all the alpha particles produced are absorbed, what time is required for this dose to be delivered?arrow_forwardA sample of radioactive material is obtained from a very old rock. The activity of the rock over a period of time is monitored, and lnA is plotted as a function of t such as in Figure (b). The slope of the line has a value of -6.1 ×10^−8y^−1. FInd the half-life in years.arrow_forwardThe half-life of iodine-131 is 8 days. How long does it take for the initial activity of 4500 kBq / m3 to drop to 65 kBq / m3? Give the answer in whole days.arrow_forward
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