Topic 47 Flashcards
When radiation passes through matter it leaves behind…
a trail of ionised atoms along its baths, which can disrupt a living cell.
Give the four major categories of radiation
Heavy Charged Particles
Electrons and Positrons
Photons
Neutrons
Give 4 types of radiation measurement
Source Activity
Exposure
Absorbed Dose
Biologically equivalent dose
What is source activity?
Rate of increase in nuclei present in the material
Unit: Bequerel
What is exposure?
The amount of radiation reaching the material. Only in x-rays and gamma rays
Unit: Röntgen
What is absorbed dose?
Amount of radiation absorbed in the material from a beam.
Unit: Rad / Gray
What is biologically equivalent dose?
The effect of radiation on a biological system.
Unit: Rem / Sievert
Give two radiation detectors
Photomultiplier
Gas Filled detector
How does a photomultiplier work?
Radiation releases an electron which multiplies in
a chamber and then are measured.
Describe Gas filled detectors
Ionisation chamber, proportional chamber, GM counter All has same design but different voltage ranges
