Radioactive Decay Processes

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What is the result of a positive beta particle coming to the end of its range in a positron emitter?

It is absorbed by the surrounding material

It emits a gamma ray

It combines with a negative electron (correct)

It decays into a neutron

What is the energy equivalent to the mass of each electron in a positron emitter?

511 keV (correct)

360 keV

280 keV

250 keV

What type of radiation is emitted when a positive electron and a negative electron annihilate each other in a positron emitter?

Beta radiation

Annihilation radiation (correct)

Gamma radiation

Alpha radiation

What is the process by which a daughter nuclide emits K-characteristic X-rays?

An electron from an outer shell fills the created in the K-shell Signup and view all the answers

What is the energy of the gamma rays emitted by Iodine-131 (131I)?

364 keV Signup and view all the answers

What is the decay mode of Iodine-123 (123I)?

Electron capture Signup and view all the answers

What is the primary function of the focusing electrode in a photomultiplier tube?

To direct the photoelectrons towards the first dynode Signup and view all the answers

What is the outcome of the collision between the primary electrons and the first dynode surface?

Liberation of more electrons Signup and view all the answers

What is the purpose of minimizing scattered gamma photons in gamma imaging?

To reduce image noise Signup and view all the answers

What is the final destination of the electrons in a photomultiplier tube?

The anode Signup and view all the answers

What is the gamma image formed on in a conventional gamma camera?

A pixelated grid Signup and view all the answers

What does the formation of a gamma image represent?

A true mapping of the radioactive agents in the targeted region Signup and view all the answers

What is the half-life of 99mTc?

6 hours Signup and view all the answers

What type of decay occurs in radionuclides with a neutron deficit?

β+ decay or K-electron capture Signup and view all the answers

What is the result of β+ decay in radionuclides with a neutron deficit?

A positron is ejected from the nucleus Signup and view all the answers

What happens to the atomic number of an atom that undergoes β+ decay?

It decreases by one Signup and view all the answers

What is the result of K-electron capture in radionuclides with a neutron deficit?

The nucleus captures an extranuclear electron Signup and view all the answers

What is the end product of the decay of 99Tc?

Ruthenium-99 (99Ru) Signup and view all the answers