0
The SI units of energy are Joules but the effects of ionizing radiation are rarely described only by the energy. The pertinent quantities are the activity (number of decays per second), the does (energy deposited per unit mass) and the equivalent dose, a related measure which takes into account the biological effect of exposure on tissues.
The SI units for these quantities are the Becquerel, the Gray and the Seivert. The equivalent units of radiation still in use in the United States are Curie, the Rad and the Rem.
The Curie or Becquerel is a measure of the ability of a source to produce ionizing radiation measured in the number of decays per second. The Becquerel is equal to one decay per second. A Curie on the other hand is equal to 3.7 x 1010 Becquerels.
The Grey is a measure of the energy deposited per kilogram of matter and dependent not only on the number of decays per second but also on the distance to the source and on the ability of any particular type of ionizing radiation to interact with matter. A Grey has units of Joules per Kilogram (100 Rad is equal to 1 Grey). The Grey does not attempt to take into account the biological damage done to different tissues.
The Seivert (or rem) is the equivalent dose or the product of the radiation intensity (Grey) and factors which attempt to account for the biological damage done to different tissues by different types of ionizing radiation. While the Sievert has the same base units as the Grey (Joules per Kilogram) they are applied differently and named separately to avoid confusion.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
What units express the difference in energy?
The same as the unit for energy. The SI unit for energy is the joule; several other units are commonly used.
Energy can be transferred through empty space by?
Energy can be transferred through empty space by radiation. Joule is the SI unit of energy.
Food energy is commonly expressed in kcalories and in?
... and in the SI unit for energy, i.e., the Joule. Kilojoules
What is the best example of a piece of machinery or equipment containing a radiological ionizing radiation energy source?
x-ray unit
Is power the rate of which work is done?
In general, work is the rate at which energy is converted, or transferred. It may specifically refer to mechanical work, but it need not be that. For example, the amount of radiation radiated by the Sun can be measured in watts (a unit of power), but most of the energy emitted is unrelated to mechanical energy.
The unit most commonly used for measuring electrical energy consumption is the?
While the SI unit - and therefore, the recommended unit - for energy is the joule, energy used in households is more commonly measured in kWh. Since a joule is a watt-second, a kWh (kilowatt-hour) is equal to 3,600,000 joules.
The standard unit of radiation related to biologic hazard is?
Radiation refers to the emission of energy as electromagnetic waves. The standard unit of radiation related to biologic hazard is Sievert and is denoted by Sv.
What units express the difference in energy?
The same as the unit for energy. The SI unit for energy is the joule; several other units are commonly used.
Energy can be transferred through empty space by?
Energy can be transferred through empty space by radiation. Joule is the SI unit of energy.
Food energy is commonly expressed in kcalories and in?
... and in the SI unit for energy, i.e., the Joule. Kilojoules
How do we express energy?
The SI unit for energy is the joule. A commonly used unit for energy is the kWh (kilowatt-hour), equal to 3.6 million joules, since a joule is the same as a Ws.
Which unit of radiation dose rem or rad is most useful for describing the effect of radiation on living tissue?
rem
Which unit of radiation dose- rem or rad -is most useful for describing the effect of radiation on living tissue?
rem
What is seivert?
The sievert is a unit of radiation dose equivalent, used to measure the biological effect of ionizing radiation on living tissue. It takes into account the type of radiation, the energy of the radiation, and the specific tissues or organs affected. The sievert is the standard unit for measuring radiation doses in the International System of Units (SI).
What is the Mathematical relation between energy of radiation and wavelength?
The energy of a basic unit of electromagnetic energy, the photon, is related directly to its frequency by a scaling factor called Planck's Constant, and the equation is often written e = Hf where e is energy unit, H is Planck's Constant and f is frequency unit.
What is a kilogray?
A unit of absorbed energy from ionising radiation equal to one thousand grays. A gray (Gy) is the SI unit of absorbed radiation dose of ionising radiation, defined as the absorption of one joule of ionising radiation by one kilogram of matter (usually human tissue).
A unit or quantum of light a particle of electromagnetic radiation that has zero rest mass and carries a quantum of energy?
Photon
