Absorbed dose

Absorbed dose is a measure of the energy deposited in a medium by ionizing radiation. It is equal to the energy deposited per unit mass of medium, and so has the unit J/kg, which is given the special name Gray (Gy).

Activity

 Activity is defined as the number of atoms of the radionuclide which undergoes the radioactive decay per one second. The unit is called Becquerel - Bq.

Alpha

Alpha radiation means the flux of emitted alpha particles which consist of two protons and two neutrons bound together into a particle identical to a helium nucleus. Alpha particles are low penetration radiation; the average distance in air is of centimetres; the average distance in tissue is of tenth of micrometers.

Beta

Beta particles are high-energy, high-speed electrons or positrons emitted by certain types of radioactive nuclei. The production of beta particles is termed beta decay.

Concentration

In connection with radon means the volume activity of radon gas in [Bq.m-3].

Dose

Dose in this text means the shortened name of the effective dose which is the equivalent dose multiplied by the tissue weighting factor.Tissue weighting factor cover the different sensitivity of human tissues and organs to radiation. The unit of effective dose is 1 Sv - Sievert.

EEC

 Equivalent equilibrium concentration is the volume activity of radon daughters which are in equilibrium with radon gas.The unit is Bq/m3.

Effective dose

The effective dose which is the equivalent dose multiplied by the tissue weighting factor.Tissue weighting factor cover the different sensitivity of human tissues and organs to radiation. The unit of effective dose is 1 Sv - Sievert.

Equivalent dose

 The equivalent dose is absorbed dose multiplied by the radiation weighting factor which covers different ionization potential of different radiations. The unit is Sievert, Sv.

Gamma

Gamma radiation is electromagnetic radiation of high frequency. Gamma radiation is high penetration radiation which can be stopped either by the thick concrete block or lead shielding.

Half-life

Half-life is the period of time it takes for a substance undergoing decay to decrease by half.

Lungs

In mammals and also human beings, the two lungs are located in the chest on either side of the heart. Their principal function is to transport oxygen from the atmosphere into the bloodstream, and to release carbon dioxide from the bloodstream into the atmosphere. This exchange of gases is accomplished in the mosaic of specialized cells that form millions of tiny, exceptionally thin-walled air sacs called alveoli. 

Pluton

A pluton in geology is an intrusive igneous rock (called a plutonic rock) body that crystallized from magma slowly cooling below the surface of the Earth. 

Radioactivity

 Radioactivity is a process by which an unstable atom is spontaneously desintegrated into another atom. This process is usually accompanied by the emission of radiation or energy loss.

Radionuclide

Radionuclide is nuclide which is unstable - undergoes the radioactive decay.

Nuclide is a group of atom which have the same number of protons and nucleons (protons, neutrons) in their nuclei.

Radium

Radium is a radioactive chemical element which has the symbol Ra and atomic number 88. Its appearance is almost pure white, but it readily oxidizes on exposure to air, turning black. Radium is an alkaline earth metal that is found in trace amounts in uranium ores. Its most stable isotope, 226Ra, has a half-life of 1601 years and decays into radon gas. 

Radon

 Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as the decay product of uranium. The half-life is 3.8 days.

Uran

Uranium is a silvery-white metallic chemical element in the actinide series of the periodic table with atomic number 92. It is assigned the chemical symbol U. 

Volume activity of radon

 Volume activity of radon is the activity of radon gas in meter cubed.