What happens when matter absorbs light

Interactions with Microwaves

The near ultraviolet is very strongly absorbed in the upper layers of the skin through electron transfers. At higher energies, the ionization energy of many molecules is reached and the more dangerous process of photoionization begins. Sunburn is mainly an effect of UV radiation and ionization increases the risk of skin cancer.

The ozone layer in the upper atmosphere is important to human health as it absorbs most of the sun's dangerous UV radiation. The higher frequencies in the ultraviolet provide ionizing radiation that can cause dangerous physiological effects, from sunburn to skin cancer.

Health concerns when exposed to UV occur in a wavelength range of 290-330 nm, called UVB. According to Scotto, et al., The wavelength that causes most sunburn is around 297nm. Their research suggests that the biological effects increase logarithmically in the UVB range, so that 330nm is only 0.1% of the biological effects of 297nm. It is therefore important to pay special attention to UVB radiation.

Interaction of radiation with matter


Scotto, et al.