Radiation Protection Lec 4: Quantities and Units

The rate at which a radioactive substance decays, measured by the number of nuclei decaying per second.

A measure of the amount of ionization produced in air by X-rays or gamma rays.

The amount of ionizing radiation energy absorbed by a material per unit mass.

A measure that considers both the absorbed dose and the type of radiation to estimate biological damage.

A measure of the overall radiation risk to the whole body, taking into account the sensitivity of different organs.

The SI unit for measuring the activity of a radioactive substance, representing the number of radioactive decays per second.

The older classical unit for measuring the activity of a radioactive substance.

The SI unit for measuring the absorbed dose of radiation, representing the energy absorbed per unit mass.

The older classical unit for measuring the absorbed dose of radiation.

The SI unit for measuring the equivalent dose of radiation, considering both the absorbed dose and the type of radiation.

Activity is the rate of decay of a radioactive substance. It describes how quickly the substance decays.

The SI unit for activity is the Becquerel (Bq). It represents one decay per second.

Exposure refers to the amount of ionization caused by X-rays or gamma rays in air. It measures the ionizing power of radiation.

The SI unit of exposure is C/kg, which stands for Coulomb per kilogram.

Absorbed dose refers to the amount of energy absorbed by a material, like tissue, from ionizing radiation, per unit mass.

The SI unit for absorbed dose is Gray (Gy), which is equivalent to 1 Joule of energy absorbed per kilogram of mass.

Equivalent dose considers the type of radiation and its biological damaging potential. It measures the impact of different types of radiation on tissue.

The SI unit of equivalent dose is Sievert (Sv).

Effective dose considers both the absorbed dose and the sensitivity of different organs to radiation to assess overall risk.

The SI unit for effective dose is also Sievert (Sv).

Activity refers to the rate at which a radioactive substance decays, measured by the number of nuclei decaying per second.

Exposure describes an x-ray or gamma ray field. It measures the amount of ionization produced in air by the radiation.

The SI unit of exposure is C/kg, Coulomb per kilogram, reflecting the charges produced.

The SI unit of equivalent dose is Sievert (Sv), representing the biological impact of absorbed energy.

The SI unit for Effective Dose is also Sievert (Sv), but it represents the overall risk to the whole body.

The SI unit of activity is the Becquerel (Bq), representing one decay per second. The old classical unit is the Curie (Ci).

The SI unit of exposure is C/kg (Coulomb per kilogram), measuring the charges produced by radiation in air. The old classical unit is the Roentgen (R).

The SI unit of absorbed dose is the Gray (Gy), equivalent to 1 Joule of energy absorbed per kilogram of mass. The old classical unit is the Rad.

The SI unit of equivalent dose is the Sievert (Sv), representing the biological impact of absorbed energy.

The SI unit for effective dose is also the Sievert (Sv), but it represents the overall risk to the entire body.