Nuclear Medicine Quiz: Gamma and Beta Decay

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Questions and Answers

What is the characteristic of beta rays emitted by some nuclei?

They are emitted with a fixed energy level
They are emitted with discrete energy levels
They are emitted with no specific energy levels
They are emitted with a continuous spectrum of energies up to a maximum (E_{max}) (correct)

What happens when a positive beta particle comes to the end of its range?

It emits gamma rays
It combines with a nearby negative electron, neutralizing each other and converting their combined masses into energy (correct)
It transforms into a different particle
It loses its positive charge

What is internal conversion in radioactive decay?

The conversion of beta particles into gamma rays within the nucleus
The conversion of alpha particles into positrons within the nucleus
Gamma rays emitted by some nuclei do not leave the atom, but are photoelectrically absorbed in its K shell, resulting in emission of photoelectrons and characteristic x-rays (correct)
The conversion of gamma rays into beta particles within the nucleus

How is the quantity of radioactivity measured?

<p>By the transformation rate (number of disintegrations per second) (B)</p> Signup and view all the answers

What does the range of beta particles depend on?

<p>The initial energy of beta particles and the density of the material (A)</p> Signup and view all the answers

Flashcards

Beta Ray Energy Spectrum

Beta particles emitted by nuclei have a continuous spectrum of energies, with a maximum energy (E_{max}).

Positron Annihilation

When a positive beta particle (positron) reaches the end of its path, it interacts with a nearby negative electron, annihilating both and releasing energy.

Internal Conversion

In internal conversion, gamma rays emitted by a nucleus are absorbed within its K shell, causing the emission of photoelectrons and characteristic X-rays.