Part 8.1

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Highly enriched uranium — uranium with uranium–235 isotope content of 20
or more per cent.
Gamma radiation — electro magnetic radiation with very short wave length
(less than 0,1 nm) appearing at radioactive transformations and nuclear reactions, at
deceleration, decay and annihilation of particles.
International Atomic Energy Agency Guarantees — international system of
control adopted in the frames of non-proliferation of nuclear weapons; system of
check applied to peaceful use of nuclear energy responsibilities of which were imposed
on International Atomic Energy Agency (IAEA) according to the Agency Charter,
Agreement on non-proliferation of nuclear weapons and Agreement on prohibition
of nuclear weapons in Latin America.
GW — gigawatt (10 9 W).
Genetic consequences of radiation — undesirable radiation consequences of
impact of ionizing radiation on living organisms resulting in changes in its hereditary
properties and revealed in descendants of the organism influenced by radiation.
Hydrometallurgical processing of uranium ore — extraction of uranium and
its compounds out of natural ore with help of chemical reagents’ water solutions and
further extraction of uranium out of these solutions. It is the main method of chemical
enrichment of uranium ore and getting uranium concentrate resulting in changing of
minerals’ compositions.
Depth of burning out — initial number of nuclei of a certain type that have
transformed in the reactor under the impact of neutrons (amount of energy got out of
fuel mass unit, expressed in MWday/kg U).
Graphite — mineral, one of crystal forms of carbon. Nuclear pure graphite
(without substances absorbing neutrons) is used as neutrons deterrent in nuclear reactors.
Gray (Gy) — unit of measuring of absorbed radiation dose in measurement
system, 1 Gy is absorption of 1 joule of energy per 1 kilogram.
GTP — gas-turbine plant.
MCP — main circulating plant.
Decontamination — removal or reducing of radioactive contamination off any
surface or environment.
Deuterium — “heavy” hydrogen isotope with atomic mass off 2.
Nuclear fission — splitting of a heavy nucleus into two parts accompanied by
extraction of relatively large amount of energy and as a rule two or three neutrons.