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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for a ussing chamber, the left side has radioactively labeled K+ ions ,the right side has unlabeled ions K+, in equal concentrations (c1=c2). Measurements conducted at +20 mV show that the radioactive flux is 10 times higher than the non-radioactive flux in the opposite direction. What is the mean occupancy of the channel by potassium, i.e. number of ions in the barrel?
In a Ussing chamber with Gramicidin channels inserted in the separating membrane.The left side has radioactively labeled K+ ions the right side has unlabeled ions K+, in equal concentrations (c1=c2). Measurements conducted at +20 mV show that the radioactive flux is 10 times higher than the non-radioactive flux in the opposite direction. What is the mean occupancy of the channel by potassium, i.e. number of ions in the barrel?
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
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_forwardYttrium-87 has a rate constant of 2.6x10^-6 s^-1. What is the activity of a 780-mg sample in Bq?arrow_forward
- A 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_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_forwardA.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_forward
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