Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 9, Problem 9.12P
To determine
The downstream water more radioactive than the water upstream
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A sample counted for 10 minutes resulted in 1,000 counts. The background count was 250
counts over a 10 minute period. Assuming negligible radioactive decay of the sample during
counting, the net counting rate in counts per minute and the standard deviation are
approximately:
a. 750±35 cpm
b. 75±10 cpm
C. 75+3.5 cpm
d. 85±5.5 cpm
e. 8±6 cpm
Yttrium-87 has a rate constant of 2.6x10^-6 s^-1. What is the activity of a 780-mg sample in Bq?
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.
Chapter 9 Solutions
Introduction To Health Physics
Ch. 9 - Prob. 9.1PCh. 9 - Prob. 9.2PCh. 9 - Prob. 9.3PCh. 9 - Prob. 9.4PCh. 9 - Prob. 9.5PCh. 9 - Prob. 9.6PCh. 9 - Prob. 9.7PCh. 9 - Prob. 9.8PCh. 9 - Prob. 9.9PCh. 9 - Prob. 9.10P
Ch. 9 - Prob. 9.11PCh. 9 - Prob. 9.12PCh. 9 - Prob. 9.13PCh. 9 - A counting system has a background of 360 counts...Ch. 9 - Prob. 9.15PCh. 9 - Prob. 9.16PCh. 9 - Prob. 9.17PCh. 9 - Prob. 9.18PCh. 9 - Prob. 9.19PCh. 9 - Prob. 9.20PCh. 9 - Prob. 9.21PCh. 9 - Prob. 9.22PCh. 9 - Prob. 9.23PCh. 9 - Prob. 9.24PCh. 9 - Prob. 9.25PCh. 9 - Prob. 9.26PCh. 9 - Prob. 9.27PCh. 9 - Prob. 9.28PCh. 9 - Prob. 9.29PCh. 9 - Prob. 9.31PCh. 9 - Prob. 9.33PCh. 9 - Prob. 9.34PCh. 9 - Prob. 9.35PCh. 9 - Prob. 9.38PCh. 9 - Prob. 9.39PCh. 9 - Prob. 9.44P
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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_forwardFind the radiation dose in Gy for: (a) A 10mSv fluoroscopic xray series. (b) 50 mSv of skin exposure by an emitter. (c) 160 mSv of and rays from the 40K in your body.arrow_forward
- How many Gy of exposure is needed to give a cancerous tumor a dose of 40 Sv if it is exposed to a activity?arrow_forwardHow many Gy of exposure is needed to give a cancerous tumor a dose of 40 Sv if it is exposed to acfivity?arrow_forwardA 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.arrow_forward
- A.G.M. counter records 4,900 background counts in 100 min. With a radioactive source in position, the same total number of counts are recorded in 20 min. Calculate the percentage of S.D. with net counts due to the source.arrow_forwardIn a laboratory accident, a work area is contaminated with radioactive material. Health physicists monitor the area during a 30-day period and obtain the data shown in the table. The accident occurred at time t = 0 days. They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 16 counts per minute. Of the choices listed, which one is the earliest time after the accident that workers could safely return? Time (days) 0 2 6 11 19 30 Counts per Minute 1000 899 726 556 356 200 a. 48 days b. 102 days c. 65 days d. 90 days e. 77 daysarrow_forwardp1arrow_forward
- The radionuclide 32P (T1/2 = 14.28 d) is often used as a tracer to follow the course of biochemical reactions involving phosphorus. (a) If the counting rate in a particular experimental setup is initially 3050 counts/s, how much time will the rate take to fall to 170 counts/s? (b) A solution containing 32P is fed to the root system of an experimental tomato plant, and the 32P activity in a leaf is measured 3.48 days later. By what factor must this reading be multiplied to correct for the decay that has occurred since the experiment began?arrow_forwardPlease provide Handwritten answer. Two 13.3 mg radium tubes are arranged in a line with their centers 5.5 cm apart. A weaker source is placed midway between them. How much radium should be in this latter source to produce the same dose rates to points opposite each of the sources at a distance of 2.0 cm away from the line. Assume sources 1.35 cm active length 1.0 mm Pt.arrow_forward✓ ON "O 2.75 MeV 0.511 MeV 0.511 MeV B, E= 1.73 MeV Eave = 0.721 Mev O MeVarrow_forward
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