Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Question
Chapter 13, Problem 13.15P
To determine
The body burden of 226Ra from the data.
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A radioactive isotope with
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A solution of In-111 DTPA from the Amersham Corp. in Great Britain arrives in your
department with the following calibration data:
Activity
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10.0 MBq
0.20 mL
Oct. 15
1200 PST
Look up the half-life of In-111 in your textbook or the Chart of the Nuclides.
How many mCi are in the vial on Oct. 12 at 0900 PST?
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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
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- Technetium-99 is an unstable isotope. Given a half-life of 8.01 hours, what is the activity (in Curies, Ci) of a 1.41 μg sample?arrow_forwardPLEASE ANSWER ASAP PLEASE A certain amount of a sample of 96X has an activity of 0.1084 μCi. In 24.2 days, the activity of the sample has declined to 0.0864 μCi. What is the half-life (in days) of 96X? Rounded off answer to a whole number (no decimal places); no units necessary.arrow_forwardA 70-kg person experiences a whole -body exposure to alpha radiation (RBE= 15) with energy 4.77 MeV. A total of 6.25×10^12 alpha particles are absorbed. a). What is the absorbed dose in rad? b). What is the equivalent dose in rem?arrow_forward
- A radioactive sample is monitored with a radiation detector which registers 11360 counts per minute. Twelve hours later, the detector reads 1420 counts per minute. Calculate the decay constant lamda of the sample. lamda = ? s^-1 Calculate the half‑life t1/2 of the sample. t1/2 = ? sarrow_forwardIf the Q-value of beta minus decay is 2.820 MeV, what is the approximate average beta energy? A. 2.820 MeV B. 1.41 MeV C. 0.94 MeV D. 0.705 MeV What is the mass defect of 8Ca? The atomic mass of nuclide is 39.963u. (mp: 1.00727646u and mn: 1.00866492u) A. 0.266 amu B. 0.356 amu C. 0.424 amu D. 0.532 amuarrow_forwardCesium-137 is radioactive and has a half life of 30. years. Calculate the activity of a 1.4 mg sample of cesium-137. Give your answer in becquerels and in curies. Be sure your answer has the correct number of significant digits. Bq Dci x10 Xarrow_forward
- 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 cpmarrow_forwardTritium (t1/2 = 12.33 y) is mostly produced for military purposes. The United States stopped producing tritium in 1988 but resumed in 2003. In 1996 it was reported that the United States had only 75 kg of tritium stockpiled. If none of it was used by 2003, how much tritium remained?arrow_forwardThe 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_forward
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