Physical properties of radiations

Question 1

Explain Alpha particles ionising power relatively to others:

Answer 1

1) It is the most ionising than other radiation
2) Because it has the GREATEST MASS, its 2+ DOUBLE CHARGE
2b) So it transfers more energy to the absorber.

Question 2

Describe Explain Alpha particles penetration relatively to others:

Answer 2

It can travel few centimetres in the air
Easily stopped by tissue or paper

Question 3

Describe Beta particles ionising power and Penetration level relatively to others:

Answer 3

Less than alpha particle, more than gamma

1m in air and stopped by aluminium (5mm) sheet or lead sheet (2-3mm)

Question 4

Describe Gamma Radiation ionising power and Penetration level relatively to others:

Answer 4

Least ionising

Unlimited in air, unabsorped
Stopped by thick lead sheet (several cm thick) or 1m thick concrete.