Современная физика

Sodium Resonance Fluorescence

Principle

Resonance fluorescence is demonstrated by illuminating a sodium vapour with white visible light. The emitted light is spectrally analyzed and shows the emission spectrum of sodium. Therefore the same atomic levels are involved in both absorption and emission.

Determination of counting rates with the Geiger-Müller coun-

Background effect

Statistical fluctuations and frequency distribution of coun-

Radioactivity of minerals

Radioactivity of potassium

Range of alpha particles

Attenuation of beta rays

Deflection of beta- particles (electrons) in a magnetic

Deflection of beta+ particles (positrons) in a magnetic

Attenuation of gamma rays

The behaviour of gamma rays in a magnetic field

The inverse-square law for gamma rays

Determination of the radioactive half-life

Level control

The stream of particles emitted from a radioactive source diminishes over time. A radioactive substance decays according to certain physical laws. In the special case of a radioactive substance comprising only one irradiating component, the quantity of material diminishes ...