2. WHAT IS ULTRAVIOLET
• Radiation in the part of the electromagnetic
spectrum where wavelengths are just
shorter than those of ordinary, visible violet
light but longer that those of x-rays.
3. EMS COMPARED TO THE OTHER SIX FORMS OF
RADIATION
• 4 times 10 to the -7 minus 10 to the -8
• Ultraviolet light is blue/green
• Ultraviolet light has high frequency and the energy
and a short wavelength
4. HUMAN RISKS FROM EXPOSURE TO
ULTRAVIOLET RADIATION A
• Ultraviolet A (UVA) ultraviolet
RADIATION with wavelengths between
320 and 400 nm.
• Ultraviolet A enhances the harmful
effects of ultraviolet B radiation and is
also responsible for some
PHOTOSENSITIVITY reactions; it is used
therapeutically in the treatment of a
variety of skin disorders.
5. HUMAN RISKS FROM EXPOSURE TO
ULTRAVIOLET RADIATION B
• Ultraviolet B (UVB) ultraviolet RADIATION with
wavelengths between 290 and 320 nm, comprising
less than 1 per cent of the ultraviolet radiation that
reaches the earth's surface.
• Ultraviolet B causes sunburn and a number of
damaging PHOTOCHEMICAL changes within cells,
including damage to DNA, leading to premature aging
of the skin, premalignant and malignant changes, and
a variety of PHOTOSENSITIVITY reactions; it is also
used therapeutically for treatment of skin disorders.
6. HUMAN RISKS FROM EXPOSURE TO
ULTRAVIOLET RADIATION C
• Ultraviolet C (UVC) ultraviolet
RADIATION with wavelengths
between 200 and 290 nm; all of
this type of radiation is filtered out
by the ozone layer so that none
reaches the earth's surface.
Ultraviolet C is germicidal and is
also used in ultraviolet
phototherapy.
7. HEALTH RISKS
• In general, UVB produces much greater
short-term effects on the skin, such as
tanning, sunburn, and damage to DNA, than
UVA. UVB is also known to reduce the
functioning of the immune system but this
is less clear for UVA.
• UVB is likely to be the main cause of
premature skin ageing and of one type of
skin cancer. However, for the most lethal
type of skin cancer, the roles of UVA and
UVB are not yet known.
8. HOW ULTRAVIOLET RADIATION IS
USED IN TANKING BEDS
• Tanning beds emits 95% of Ultraviolet
Radiation(UVA)
• Only 5% Ultraviolet Radiation
• Emits about 150 watts
• Ultraviolet Radiation is also known as tanning
ray
• Safe limits for preventing short-term effects of
UV radiation from sunbeds, such as sunburn,
depend on skin type. The dose of UV radiation
received during each tanning session should be
small enough to avoid sunburn
9. CITES
• Ultraviolet radiation human exposure and
health risks
• Google
• Bing
