Radiation is energy in the form of waves (beams) or particles. Radiation waves are generally invisible, have no weight or odor, and have no positive or negative charge.
Ionizing radiation has a lot of energy that gives it the ability to cause changes in atoms—a process called ionization.
Non-ionizing radiation has less energy than ionizing radiation. When non-ionizing radiation interacts with atoms, it does not cause ionization. Radio and TV signals, microwaves, and laser light are non-ionizing types of radiation.
Some forms of non-ionizing radiation can damage tissues if we are exposed too much. For instance, too much ultraviolet (UV) light from lying out in the sun is known to cause some skin cancers; even moderate amounts can cause skin burns. Resources: Radiation answers.org
UVA : at wavelengths of 320-400 nm accounts for 90% of UVR reaching the Earth’s surface.
UVB : 290-320 nm is 10% of UVR reaching the earth surface and is largely responsible for skin cancer. UV-B is absorbed in the upper stratosphere (about 25 miles above the earth) at the level of the ozone layer. uVB is 1000 times more potent in causing sunburn (erythema) than UVA.
UVC : 200-290 nm is absorbed in the upper atmosphere, but would cause severe cellular damage if it reached living organisms.
How can you be Protected? A Sun Protection Factor (SPF *) >15 is required; more than 15 times the sun exposure is required to produce the same reddening of skin by comparison with unprotected skin.
The greater the SPF, the greater the protection.
*Avoid tanning parlors & overexposure to the Sun, wear protective clothing and immediately check out any unfamiliar skin lesions.* Resource: Alphanutrition.com