Radiation safety

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Notes
Electromagnetic (EM) radiation is a continuous spectrum of energy ranging from short wavelength and high frequency (i.e., X-rays) to long wavelength and low frequency (i.e., radiofrequency). The chart - Lenovo VDT Emission Levels (Figure 4) displays the various groupings of EM radiation, their associated standard, and the approximate fraction of that level emitted by an Lenovo visual display terminal (VDT). This section gives a short explanation of the various terms used in Figure 4. Click on Standards above to view Figure 4.

"Type of Radiation"

This column describes the various delineations of the EM spectrum. The shorter wavelength groups are described by their wavelengths in nanometers (nm). The microwave and radiofrequency portions of the spectrum are described by their frequency in hertz (Hz). All EM emissions have both a frequency and wavelength, but scientists use one or the other
to describe the fields they are concerned with. One Hertz is one cycle per second and the prefixed of K, M, and G correspond to kilo (1000), mega (1,000,000) and giga (1,000,000,000) respectively.

"Lowest Applicable Health Standard"

This column denotes the lowest applicable health standard or guideline for that range of EM radiation and the group that established it. The units are as follows:

	= wavelength
mR/hr	= milliroentgen per hour
μW/cm2	= microwatt per square centimeter
mW/cm2	= milliwatt per square centimeter
cd/cm2	= candela per square centimeter
gauss	= a unit of magnetic field strength

The standards groups are as follows:

"Fraction of Standard from Lenovo VDT"

This column notes the fraction of the applicable health standard which is typically emitted by a Lenovo cathode ray tube display.

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