- 産業: Education
- Number of terms: 3412
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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.
The amount of ionization in air caused by x-ray or gamma ray radiation per unit time; unit of measurement is the Roentgen per unit time (R/hr)
Industry:Environment
The portion of the dose equivalent received from radiation sources outside the body.
Industry:Environment
Applies to the external exposure of the lens of the eye and is taken as the dose equivalent at a tissue depth of 0. 3 cm.
Industry:Environment
Relatively short wavelength electromagnetic radiation released from the nucleus of an atom.
Industry:Environment
A radiation detection instrument that can detect alpha, beta and gamma radiation; response is not energy dependent.
Industry:Environment
The time in which half the atoms of a particular radioactive substance disintegrate to another nuclear form. Measured half lives vary from millionths of a second to billions of years. Also referred to as the physical half-life.
Industry:Environment
The thickness of any given absorber (shield) that will reduce the intensity of incident radiation to one half of its initial value.
Industry:Environment
The science concerned with recognition, evaluation, and control of health hazards from non-ionizing and ionizing radiation.
Industry:Environment
An area, accessible to individuals, in which radiation levels could result in an individual receiving a dose equivalent in excess of 0. 1 mrem in 1 hour at 30 cm from the radiation source or from any surface that the radiation penetrates.
Industry:Environment
