More about alpha,beta and gamma radiation Flashcards Preview

GCSE Physics: Topic 7 > More about alpha,beta and gamma radiation > Flashcards

Flashcards in More about alpha,beta and gamma radiation Deck (11):

What is ionization?

Radiation from radioactive substances can knock electrons out of atoms

Atoms become positively charged when losing electrons


How can ionisation in living cell?

Damage/kill the cell


How does an object become irradiated?

If it is exposed to ionizing radiation

Remember that the object does not become radioactive


What is radioactive contamination?

Is unwanted presence of materials containing

radioactive atoms on other materials


How are alpha particles strongly ionising?

Consist of two protons and two neutrons

Relatively large , alpha particles have lots of collisions with atoms


What can alpha particles be stopped by?

With collisions, alpha particles do not penetrate far into thin sheet or paper, human skin or few centimetres of air 


What movement of the beta particle?

Fast-moving electrons emitted from the nucleus 


How are beta particles less ionizing?

Much smaller and faster than alpha particles 

less ionising and penetrate further into material than alpha particles 


What are beta particles blocked by?

Thin sheet of aluminium or few metres of air 


How are gamma radiation weakly ionising and very penetrating?

They are electromagnetic waves so they travel a long way through material before colliding with atom


What can stop gamma radiation?

Several centimetres of lead/concrete needed to be absorbed 

ultimate range in the air