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Flashcards in Motion of particles Deck (12):
1

What is a cyclotron an example of?

A particle accelerator

2

If an object is travelling in a circle it is constantly changing direction, thus accelerating, what does this mean?

That there must be a resultant force acting on it

3

What are charged particles effected by?

A magnetic field

4

What does proton enrichment do?

Forms isotopes

5

What do these isotopes do?

Emit positrons

6

How are some radioisotopes produced?

Bombarding stable elements with protons

7

What happens to these protons?

They are absorbed by the nucleus, increasing the proton number and therefore making a new element

8

Where are positron emitters used?

In hospitals, (PET scanning)

9

Why is it important that radioisotopes used for PET scanning have a short half life?

So that patients exposure to radiation is minimised.

10

Fill in the gap:
Collisions can be _______ or ________

1. Elastic
2. Inelastic

11

State the two things that are conserved in positron/electron annihilation

1.Momentum
2.Mass energy

12

State one use of positron/electron annihilation

In PET scanning