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10 Questions

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Radioactive Decay: Alpha and Beta Decay

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Questions and Answers

What is the primary reason for desiring fast radioactive decay in radiopharmaceuticals?

To increase the total patient exposure.

To localize the radiopharmaceutical at the target site.

To extend the examination time.

To reduce the total patient exposure. (correct)

What percentage of initially administered 18F is left after 12 hours?

25%

1.6% (correct)

0.5%

50%

Why is the fraction of 18F remaining even lower than expected after 12 hours?

Due to the emission of gamma rays.

Due to the presence of a stable daughter nucleus.

Due to slow radioactive decay.

Due to the radiopharmaceutical being excreted through the urine. (correct)

What is a desirable characteristic of an ideal radiopharmaceutical?

A short physical half-life. Signup and view all the answers

What should be the effective half-life of an ideal radiopharmaceutical?

Approximately equal to the examination time. Signup and view all the answers

What type of radiation is desirable in an ideal radiopharmaceutical?

Pure gamma rays. Signup and view all the answers

What should be the energy of the gamma rays emitted by an ideal radiopharmaceutical?

Mono-energetic. Signup and view all the answers

What should be the site of localization for an ideal radiopharmaceutical?

The target site. Signup and view all the answers

What is the advantage of the Cyclone-30 isotope-producing cyclotron?

It is power-efficient. Signup and view all the answers

What happens to the atomic number of a nucleus when it emits a gamma ray?

It remains the same. Signup and view all the answers