- 업종: Education
- Number of terms: 3412
- Number of blossaries: 0
- Company Profile:
Harvard University is the oldest institution of higher learning in the United States. It was established in 1636 by the Massachusetts legislature and named after its first benefactor, John Harvard. Located in Cambridge, Massachusetts, Harvard University is an Ivy League university.
Reduction of radiation by placing a shield of absorbing material between any radioactive source and a person, work area, or radiation sensitive device.
Industry:Environment
Usually a manmade sealed source of radiation used in teletherapy, radiography, as a power source for batteries, calibration, or in various industrial gauges. Machines such as accelerators, radioisotope generators, and natural radionuclides may be considered sources.
Industry:Environment
Exposure standards, permissible concentrations, rules for safe handling, regulations for transportation, regulations for industrial control of radiation and control of radioactive material by legislative means.
Industry:Environment
An officially prescribed symbol (a magenta trefoil) on a yellow background that must be displayed where certain quantities of radioactive materials are present or where certain doses of radiation could be received.
Industry:Environment
A solid, liquid, or gaseous material from experiment/research operations that is radioactive and for which there is no further use.
Industry:Environment
The spontaneous emission of radiation, generally alpha particles, beta particles, or gamma rays from the nucleus of an unstable isotope.
Industry:Environment
An unstable isotope of an element that decays or disintegrates spontaneously, emitting radiation.
Industry:Environment
The special unit for dose equivalent. The dose equivalent in rem is equal to the absorbed dose in rads, multiplied by the quality factor.
Industry:Environment
A unit of exposure to ionizing radiation. It is that amount of gamma or x-rays required to produce ions carrying 1 electrostatic unit of electrical charge in 1 cubic centimeter of dry air under standard conditions. Named after Wilhelm Roentgen, German scientist who discovered x-rays in 1895.
Industry:Environment
An area, access to which is limited by the licensee for the purpose of protecting individuals against undue risks from exposure to radiation or radioactive materials. Restricted area does not include areas used as residential quarters, offices, etc.
Industry:Environment
