Radiation

Question 1

What is the symbol for activity on the formula sheet?

Answer 1

A

Question 2

What is the symbol for absorbed dose on the formula sheet?

Answer 2

D

Question 3

What is the symbol for equivalent dose on the formula sheet?

Answer 3

H

Question 4

What is the symbol for equivalent dose rate on the formula sheet?

Answer 4

H

Question 5

What is the unit for Activity (A)?

Answer 5

Bq

Becquerels

Question 6

What is the unit for absorbed dose (D)?

Answer 6

Gy

Gray

Question 7

What is the unit for Equivalent dose (H)?

Answer 7

Sv

Sieverts

Question 8

What’s the difference between fission and fusion?

Answer 8

Fission: Large nucleus splits into 2 smaller nuclei and gives off energy

Fusion: 2 small nuclei fuse/combine together to create 1 larger nucleus and gives off energy

Question 9

What’s the charge on a gamma ray?

Answer 9

It has no charge - it’s an electromagnetic wave

Question 10

What’s the charge on an alpha particle?

Answer 10

positive

Alpha particle is a helium nucleus

Question 11

What’s the charge on a beta particle?

Answer 11

negative

a beta particle is a high energy electron

Question 12

What’s the symbol for equivalent dose rate on the formula sheet?

Answer 12

Ḣ

Question 13

What is half-life?

Answer 13

The time taken for the activity to halve

Question 14

How do you work out half life from a graph of activity against time?

Answer 14

Measure an activity from the graph and write down what the time is (T1)

Now halve that activity and read off the new time (T2) from the graph

The half life is T2-T1