EBK INTRODUCTION TO SPECTROSCOPY
5th Edition
ISBN: 9780100476806
Author: Kriz
Publisher: YUZU
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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?
Chromium-51 is used in imaging red blood cells and has an effective half-life of 27 days.
If a dose with an activity of 24 μCiμCi is given to a patient, how long will it take for the patient to have less than 3 μCiμCi present?
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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- If the half-lifenof cesium-137 is 30 years, approximtely how much time is required to reduce a 1kilogram sample to about 1 g?arrow_forwardWhat is the half-life, t½, (in hr) when the concentration was 100 mg/L?arrow_forwardIf meat is irradiated with 2523.0 Gy of x-rays, most of the bacteria are killed and the shelf life of the meat is greatly increased. Assuming steak with a mass of 0.340 kg has the same specific heat as water, what temperature increase is caused by a 2523.00-Gy absorbed dose? The specific heat capacity of water is 4186 J/(kg·K). ________ °C. Needs Complete typed solution with 100 % accuracy.arrow_forward
- If a patient receives a dose with an activity of 37.5 mCi of technetium-99m for cardiac imaging, how much radioactivity will be left in the patient’s body 72 hours after injection?arrow_forwardCalculate 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_forwardTechnetium-99m is very useful in diagnostic imaging since it has a short effective half-life of 4.8 hours. If a patient receives a dose with an activity of 41.6 mCimCi of technetium-99m for cardiac imaging, how much radioactivity will be left in the patient’s body 72 hours after injection?arrow_forward
- Technetium-99 m has a half life of 4.8 hours. If a patient receives a dose with an activity of 60.2 mCi of Technetium 99 for cardiac imaging how much radioactivity will be left in the patients body 48 hours after injection?arrow_forwardA sample of silver contains 5.00 micrograms of Ag-105. Determine the activity of the sample in millicuries? T1/2=41.29 daysarrow_forwardA medical laboratory stock solution is prepared with an initial activity due to 24Na of 2.5 mCi/mL, and 10.0 mL of the stock solution is diluted at t0 = 0 to a working solution whose total volume is 250 mL. After 48 h, a 5.0 - mL sample of the working solution is monitored with a counter. What is the measured activity? Note: 1 mL = 1 milliliter.arrow_forward
- What is the mad number of a nucleotide that is half the diameter of a U-238 nucleus?arrow_forwardWhat is the mass of 60 Co in a cancer therapy transillumination unit containing 5.00 kCi of 60 Co ?arrow_forwardThe Q-value of a reaction is the amount of energy released during the reaction. It is stated thatin step 1 of the PPI thermonuclear reaction chain,1H +1H → 2H + e+ + ν,1.44 MeV energy is released; then in step 2: 2H + 1H → 3He + γ and step 3,3He + 3He → 4He + 1H + 1H, 5.5 MeV and 12.8 MeV are released, respectively. Prove byappropriate calculation that the above quoted Q-values in MeV are true. The relevant masses:hydrogen 1.00782503214, helium-4 4.002603, positron 0.00054857991, deuterium 2.0141 andhelium-3 3.0160 are all quoted in the atomic units of mass which is 1.6605387 × 10−27 kg. Ignorethe neutrino contribution.arrow_forward
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