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Flashcards in Radiation Deck (15):
1

What are the three types of radiation ?

Alpha beta and gamma

2

What is the alpha particle made up of?

2 protons and 2 neutrons

3

What is the relative mass and charge of an alpha particle?

Relative mass = 4
Relative charge= +2

4

What is a beta particle made up of?

An electron

5

What is the relative mass and charge of a beta particle?

Relative mass is effectively 0 and relative charge is -1.

6

What is gamma radiation?

A high energy high frequency wave with no mass or charge.

7

Which type of nuclear radiation is most dangerous?

Alpha is the biggest with the greatest charge therefore the most ionising. Ionising can mutate or kill a cell.

8

In order which radiation is most to least Ionising?

Most- alpha, beta, gamma - Least

9

What is the range of alpha in air and what is it stopped by?

Range in air- a few cm.
Stopped by thin paper

10

What is the range of beta in air and what is it stopped by?

Range in air- 1m
Stopped by aluminium

11

What is the range of gamma in air and what is it stopped by?

Range in air- unlimited
Stopped by concrete or lead

12

Radioactive particles in magnetic and electric fields

South= negative
North= positive

Alpha particles are deflected south as has a positive charge and opposites attract. Beta has a negative charge so is deflected North. Gamma has no charge so isn’t attracted

(Same in electric field- beta goes to positive and alpha to negative)

13

How does mass and atomic number change in alpha decay?

Mass number decreases by 4
Atomic number decreases by 2

14

How does mass and atomic number change in beta decay?

Atomic number increases by one

15

What is half life?

The half life of a radioactive isotope is the average time it takes for the number of nuclei in the isotope to have or the time it takes for the count rate from a sample to fall to half the initial level