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What is Ionizing Radiation?

A good website explaining ionizing radiation from the World Health Organisation

http://www.who.int/ionizing_radiation/about/what_is_ir/en/index.html

What is Hawking Radiation?

Black holes emit particles through Hawking radiation. Find out what it is here.

http://www.howitworksdaily.com/space/what-is-hawking-radiation/

Hyperphysics - Intensity of Radiation

Page talking about intensity of radiation in roentgens and use with X -ray machines.

http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/radrisk.html#c4

What is Hawking radiation?

A description of Hawking radiation, which, theoretically, causes black holes to shrink.

http://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/hawking.html

Cosmic Background Radiation

A uniform background radiation in the microwave region of the spectrum is observed in all directions in the sky. It shows the wavelength dependence of a "black body" radiator at about 3 Kelvins ...

http://hyperphysics.phy-astr.gsu.edu/hbase/bkg3k.html#c1

How Nuclear Radiation Works

A brief description of how Nuclear Radiation works from HowStuffWorks.com. Covering atomic structure, particles, radioactive decay, applications, naturally occurring isotopes.

http://www.howstuffworks.com/nuclear.htm

In order to explain the frequency distribution of radiation from a hot cavity (blackbody radiation) Planck proposed the ad hoc assumption that the radiant energy could exist only in discrete quanta ...