Radioactive decay and half-life

1

Gamma radiation can be significantly reduced by…

2

Gamma radiation is...

3

Which form of radiation has the highest ionising power?

4

What causes an atom's nucleus to become unstable?

5

What is the activity of a source that emits 1,200 particles per minute?

6

Which type of radiation has the greatest range in air?

7

What is the atomic number Z ( _{6}^{14}\textrm{C}\rightarrow_{Z}^{14}\textrm{N}+_{-1}^{0}\textrm{e}) of the nitrogen nucleus formed in the decay of carbon-14?

8

What is the half-life of a radioactive source?

9

A radioactive source has an activity of 3600 Bq and a half-life of 14 days. What is the activity of the source 42 days later?

10

A radioactive sample has a count rate of 10,000 Bq. 24 days later the activity has fallen to 625 Bq. What is the half-life of the sample?