Topic 47

Question 1

When radiation passes through matter it leaves behind…

Answer 1

a trail of ionised atoms along its baths, which can disrupt a living cell.

Question 2

Give the four major categories of radiation

Answer 2

Heavy Charged Particles

Electrons and Positrons

Photons

Neutrons

Question 3

Give 4 types of radiation measurement

Answer 3

Source Activity

Exposure

Absorbed Dose

Biologically equivalent dose

Question 4

What is source activity?

Answer 4

Rate of increase in nuclei present in the material

Unit: Bequerel

Question 5

What is exposure?

Answer 5

The amount of radiation reaching the material. Only in x-rays and gamma rays

Unit: Röntgen

Question 6

What is absorbed dose?

Answer 6

Amount of radiation absorbed in the material from a beam.

Unit: Rad / Gray

Question 7

What is biologically equivalent dose?

Answer 7

The effect of radiation on a biological system.

Unit: Rem / Sievert

Question 8

Give two radiation detectors

Answer 8

Photomultiplier

Gas Filled detector

Question 9

How does a photomultiplier work?

Answer 9

Radiation releases an electron which multiplies in

a chamber and then are measured.

Question 10

Describe Gas filled detectors

Answer 10

Ionisation chamber, proportional chamber, GM counter All has same design but different voltage ranges