X-ray was first found by German scientist W.C. Röntgen (1845-1923), in November 8th, 1985.
The flow of energy released from unstable atom or nucleus
α-ray, β-ray, γ-ray, neutron-ray
Produced by radioactive decay
Produced by bremsstrahlung
What is radioactivity?
Criterion for indicating a radioactive substance
* 1Bq= a quantity of radioactive material in which one nucleus decays per second
Radiation releasing object
Natural radiation and artificial radiation
Radioactive Substance Isotope
RI : Radio-Isotope
Substances containing radionuclides above a certain level, voluntary and continuous radiation release
(Ex: Uranium, Radium, Thorium)
RG : Radio-Generator
Artificially transform and release other forms of energy(ex: electricity) to radiation energy