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Questions and Answers
What is the physical half-life of a radionuclide?
What is the physical half-life of a radionuclide?
- The time taken for its activity to decay to one-quarter of its original value
- The time taken for its activity to decay to three-quarters of its original value
- The time taken for its activity to decay to zero
- The time taken for its activity to decay to half of its original value (correct)
What happens to the number of radioactive nuclei over time?
What happens to the number of radioactive nuclei over time?
- It decreases exponentially (correct)
- It remains constant
- It fluctuates randomly
- It increases exponentially
How many half-lives does it take to reduce the activity of a radionuclide by a factor of 1000?
How many half-lives does it take to reduce the activity of a radionuclide by a factor of 1000?
- 5
- 20
- 10 (correct)
- 15
What is the effect of heat, pressure, electricity, or chemical reactions on the physical half-life?
What is the effect of heat, pressure, electricity, or chemical reactions on the physical half-life?
What happens to the number of radioactive nuclei in two successive half-lives?
What happens to the number of radioactive nuclei in two successive half-lives?
What is the shape of the graph of the number of nuclei present as a function of time?
What is the shape of the graph of the number of nuclei present as a function of time?
What is a characteristic of the physical half-life?
What is a characteristic of the physical half-life?
What is the range of physical half-life of radionuclides?
What is the range of physical half-life of radionuclides?
Which radionuclide has a physical half-life of 67 hours?
Which radionuclide has a physical half-life of 67 hours?
What is the term for the pharmaceutical that has been labelled with a radionuclide?
What is the term for the pharmaceutical that has been labelled with a radionuclide?
What is the biological half-life of a pharmaceutical referring to?
What is the biological half-life of a pharmaceutical referring to?
Why do radionuclides form part of a salt or organic compound in medical imaging?
Why do radionuclides form part of a salt or organic compound in medical imaging?
What is the term for the time it takes for the concentration of a radionuclide to decrease by half in the body?
What is the term for the time it takes for the concentration of a radionuclide to decrease by half in the body?
What happens to a radiopharmaceutical when it is administered alone?
What happens to a radiopharmaceutical when it is administered alone?
What determines the decay of radioactivity in a specific tissue or organ when a radiopharmaceutical is administered to a patient?
What determines the decay of radioactivity in a specific tissue or organ when a radiopharmaceutical is administered to a patient?
What is the relationship between the effective half-life and the physical and biological half-lives?
What is the relationship between the effective half-life and the physical and biological half-lives?
What is a desirable property of a radionuclide for imaging?
What is a desirable property of a radionuclide for imaging?
What is the significance of the daughter nuclide in a radiopharmaceutical?
What is the significance of the daughter nuclide in a radiopharmaceutical?
Why is it important to consider the disease state of the patient when using radiopharmaceuticals?
Why is it important to consider the disease state of the patient when using radiopharmaceuticals?
What happens if the physical half-life of a radionuclide is too short?
What happens if the physical half-life of a radionuclide is too short?
What is the relationship between the effective half-life and the physical and biological half-lives in terms of their reciprocals?
What is the relationship between the effective half-life and the physical and biological half-lives in terms of their reciprocals?
What type of radiation is desirable for imaging due to its ability to exit the patient?
What type of radiation is desirable for imaging due to its ability to exit the patient?
What is the ideal energy range of gamma rays for imaging?
What is the ideal energy range of gamma rays for imaging?
What property of gamma rays is useful for eliminating scattered radiation?
What property of gamma rays is useful for eliminating scattered radiation?
Why is it important for a radionuclide to be easily attached to a pharmaceutical at room temperature?
Why is it important for a radionuclide to be easily attached to a pharmaceutical at room temperature?
What is a desirable property of a radionuclide for imaging in terms of availability?
What is a desirable property of a radionuclide for imaging in terms of availability?
What is the significance of high specific activity in a radionuclide?
What is the significance of high specific activity in a radionuclide?
What is a desirable property of a radiopharmaceutical in terms of localization?
What is a desirable property of a radiopharmaceutical in terms of localization?
Why is it important for a radiopharmaceutical to have a low toxicity?
Why is it important for a radiopharmaceutical to have a low toxicity?
What is a desirable property of a radiopharmaceutical in terms of elimination?
What is a desirable property of a radiopharmaceutical in terms of elimination?
What is a desirable property of a radiopharmaceutical in terms of stability?
What is a desirable property of a radiopharmaceutical in terms of stability?
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