Презентация на тему Gamma radiation

of electromagnetic radiation with a very short wavelength -

<5 × 10-3 nm and, therefore, pronounced corpuscular and wave properties mild.

Gamma radiation is

Gamma rays - a form of the very high energy

waves gamma rays bordered by X-rays, taking the higher

frequency range and energy.

Gamma radiation is emitted in transitions between excited states of atomic nuclei by nuclear reactions, as well as the rejection of energetic charged particles in magnetic and electric fields.

Open Pol Willard in 1900 in the study of radium radiation.

Photon elementary particle, the quantum of electromagnetic radiation.

deflected by electric and magnetic fields have greater penetrating

power and energy at equal other conditions being equal. Gamma rays cause ionization of atoms of the substance

Physical properties

Art illustration: the atomic nucleus emits a gamma ray.

atoms of the substance. Main processes occurring during the

passage of gamma rays through the substance:

The photoelectric effect - energy gamma ray is absorbed by the nucleus of the atom, and electrons are emitted from the outer shell of an atom.
Compton scattering (Compton effect) - gamma quanta scattered in the interaction with the electron, forming a new gamma rays at energies.
The effect of the pairing - gamma photon in the nuclear field is converted into an electron and a positron.
Nuclear photoelectric effect - at energies above a few tens of MeV gamma ray is able to knock out the nucleons of the nucleus.

a layer of material. The effectiveness of protection with

increasing layer thickness, density, material and content in it of heavy nuclei (lead, tungsten, depleted uranium, etc.) is increased

Protection

radiation is used in the art (eg., Inspection), radiation

chemistry (for initiating chemical reactions, eg., In the polymerization), agriculture and food industry (mutation to generate economically useful forms, sterilization products), medical (sterilization buildings, objects, radiotherapy)