X-Ray Traditional Cache
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This cache is on a Coalition Forces (CF) Military Base. All US
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that are authorized on base can access this cache. This cache is
not within any secondary perimeter or high security area.
X-radiation (composed of X-rays) is a form of electromagnetic
radiation. X-rays have a wavelength in the range of 10 to 0.01
nanometers, corresponding to frequencies in the range 30 petahertz
to 30 exahertz (3 × 1016 Hz to 3 × 1019 Hz) and energies in the
range 120 eV to 120 keV. They are shorter in wavelength than UV
rays. In many languages, X-radiation is called Röntgen radiation
after Wilhelm Conrad Röntgen, who is generally credited as their
discoverer, and who had called them X-rays to signify an unknown
type of radiation.
X-rays are primarily used for diagnostic radiography and
crystallography. As a result, the term X-ray is metonymically used
to refer to a radiographic image produced using this method, in
addition to the method itself. X-rays are a form of ionizing
radiation and as such can be dangerous.
X-rays from about 0.12 to 12 keV are classified as soft X-rays, and
from about 12 to 120 keV as hard X-rays, due to their penetrating
abilities.
Perhaps surprisingly however, the distinction between X-rays and
gamma rays has changed in recent decades. Originally, the
electromagnetic radiation emitted by X-ray tubes had a longer
wavelength than the radiation emitted by radioactive nuclei (gamma
rays). So older literature distinguished between X- and gamma
radiation on the basis of wavelength, with radiation shorter than
some arbitrary wavelength, such as 10-11 m, defined as gamma rays.
However, as shorter wavelength continuous spectrum "X-ray" sources
such as linear accelerators and longer wavelength "gamma ray"
emitters were discovered, the wavelength bands largely overlapped.
The two types of radiation are now usually defined by their origin:
X-rays are emitted by electrons outside the nucleus, while gamma
rays are emitted by the nucleus.
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