What is the unit of activity for a radioactive source?
What is one Bequerel?
One decay a second
What is the absorbed dose D ?
The energy absorbed by 1kg of a material
What is the unit of absorbed dose?
What is one Gray?
One Joule per Kilogram
What does the risk of biological harm depend on?
1) The absorbed dose D
2) The type of radiation
3) Which part of the body is exposed
What does the radiation weighting factor tell us?
The biological effect the radiation has
What is equivalent dose H ?
Absorbed dose x Weighting factor
Measured in Seiverts (Sv)
What can affect background radiation?
1) Cosmic Rays (natural)
2) Rocks (natural)
3) Nuclear weapon testing (man made)