Textbook Question
Two technicians in a nuclear laboratory were accidentally exposed to radiation. If one was exposed to 8 mGy and the other to 5 rad, which technician received more radiation?
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Ch.5 Nuclear Chemistry
Timberlake14thChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249
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Table of contents
- Ch.1 Chemistry in Our Lives19
- Ch.2 Chemistry and Measurements80
- Ch.3 Matter and Energy53
- Ch.4 Atoms and Elements58
- Ch.5 Nuclear Chemistry42
- Ch.6 Ionic and Molecular Compounds57
- Ch.7 Chemical Quantities and Reactions38
- Ch.8 Gases30
- Ch.9 Solutions50
- Ch.10 Acids and Bases and Equilibrium64
- Ch.11 Introduction to Organic Chemistry: Hydrocarbons77
- Ch.12 Alcohols, Thiols, Ethers, Aldehydes, and Ketones82
- Ch.13 Carbohydrates54
- Ch.14 Carboxylic Acids, Esters, Amines, and Amides91
- Ch.15 Lipids61
- Ch.16 Amino Acids, Proteins, and Enzymes84
- Ch.17 Nucleic Acids and Protein Synthesis86
- Ch.18 Metabolic Pathways and ATP Production73
Timberlake14thChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249Not the one you use?Change textbook
Chapter 5, Problem 28b
The dosage of technicium-99m for a lung scan is 20. µCi/kg of body mass. How many millicuries of technicium-99m should be given to a person weighing 50. kg (1 mCi = 1000 µCi)
Verified step by step guidance1
Step 1: Understand the problem. The dosage of technicium-99m is given as 20 µCi/kg of body mass, and the person weighs 50 kg. The goal is to calculate the total dosage in millicuries (mCi). Note that 1 mCi = 1000 µCi.
Step 2: Calculate the total dosage in microcuries (µCi) by multiplying the dosage per kilogram by the person's weight. Use the formula: , where Dosage = 20 µCi/kg and Weight = 50 kg.
Step 3: Convert the total dosage from microcuries (µCi) to millicuries (mCi). Use the conversion factor: . Divide the total dosage in µCi by 1000 to get the value in mCi.
Step 4: Write the final expression for the dosage in mCi: . Substitute the calculated value from Step 2 into this formula.
Step 5: Verify the units and ensure the final answer is expressed in millicuries (mCi). Double-check the calculations for accuracy and confirm the result aligns with the problem requirements.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Radioactive Dosage Calculation
Radioactive dosage calculation involves determining the appropriate amount of a radioactive substance to administer based on a patient's body mass. In this case, the dosage of technetium-99m is given in microcuries per kilogram, requiring multiplication by the patient's weight to find the total dosage in microcuries.
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Measuring Radioactivity Concept 1
Unit Conversion
Unit conversion is the process of changing a quantity expressed in one unit to another unit. In this scenario, it is essential to convert microcuries (µCi) to millicuries (mCi) since the final answer is required in millicuries. Understanding the relationship between these units (1 mCi = 1000 µCi) is crucial for accurate calculations.
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Technetium-99m
Technetium-99m is a widely used radioactive isotope in medical imaging, particularly in nuclear medicine for diagnostic scans. Its properties allow for effective imaging of various organs, including the lungs, making it essential to understand its dosage and safety in clinical applications. Knowledge of its half-life and biological behavior is also important for ensuring patient safety.
Related Practice
Textbook Question
Two samples of a radioisotope were spilled in a nuclear laboratory. The activity of one sample was 8 kBq and the other 15 mCi. Which sample produced the higher amount of radiation?
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Textbook Question
Suppose a person absorbed 50 mrad of alpha radiation. What would be the equivalent dose in millisieverts?
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Textbook Question
For each of the following, indicate if the number of half-lives elapsed is:
1. one half-life
2. two half-lives
3. three half-lives
c. a sample of Au-198 with a half-life of 2.7 days after 5.4 days
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Textbook Question
Strontium-85, used for bone scans, has a half-life of 65 days.
b. How long will it take for the radiation level of strontium-85 to drop to one-eighth of its original level?
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Textbook Question
Fluorine-18, which has a half-life of 110 min, is used in PET scans.
b. If 100. mg of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active when the sample arrives at the radiology laboratory at 1:30 p.m.?
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