half life and radiation

Question 1

what is half life?

Answer 1

the time taken for the number of radioactive nuclei in an isotope to halve

Question 2

what is radioactive activity measured in?

Answer 2

bequerels (Bq)

Question 3

what does a short half life mean?

Answer 3

the activity falls quickly

Question 4

what does a long half life mean?

Answer 4

the activity falls more slowly

Question 5

what is background radiation?

Answer 5

the low level radiation that’s around us all the time

Question 6

what is radiation dose measured in?

Answer 6

sieverts (Sv)

Question 7

what is irradiation?

Answer 7

when something is exposed to radiation. it doesn’t make it radioactive

Question 8

what is contamination?

Answer 8

when unwanted radioactive atoms get onto or into an object.

Question 9

what is contamination?

Answer 9

when unwanted radioactive atoms get onto or into an object.

Question 10

name uses of radiation

Answer 10

medical tracers and radiotherapy

Question 11

name risks of radiation

Answer 11

ionising atoms and molecules within cells, tissue damage, cancer, radiation sickness