The document discusses ultraviolet (UV) rays, including: - UV rays come from the sun and other sources like tanning beds. While UV rays produce vitamin D, overexposure can cause health risks like skin cancer. - There are three main types of UV rays - UVA, UVB, and UVC - classified by wavelength. UVA and UVB can affect health but UVA penetrates deeper. - UV rays have benefits like vitamin D production but risks include sunburn, skin damage, eye diseases, and skin cancers from overexposure. UV light technology can also kill bacteria and viruses.

1. Presentation in
Science about
UV Rays
Taking steps to protect yourself from the
sun is a year-round responsibility. Protect
yourself and others from the sun with
shade, a shirt, or sunblock (SPF 15+) all year
long :)
THE PRESENTORS:
Samantha Faith A. Briones
Krystel Alleiah B. Montemor

2. Defenition of
UV Rays

3. Our natural source of UV radiation:
The sun
Some artificial sources of UV radiation include:
Tanning beds
Mercury vapor lighting (often found in stadiums and school
gyms)
Some halogen, fluorescent, and incandescent lights
Some types of lasers
UV Radiation
~ Ultraviolet (UV) radiation is a form of non-ionizing radiation that is
emitted by the sun and artificial sources, such as tanning beds. While it
has some benefits for people, including the creation of Vitamin D, it
also can cause health risks.

4. UV Radiation
~ Ultraviolet radiation is produced by high-temperature surfaces, such
as the Sun, in a continuous spectrum and by atomic excitation in a
gaseous discharge tube as a discrete spectrum of wavelengths. Most
of the ultraviolet radiation in sunlight is absorbed by oxygen in Earth’s
atmosphere, which forms the ozone layer of the lower stratosphere. Of
the ultraviolet that does reach Earth’s surface, almost 99 percent is
UVA radiation.

5. Types of UV
RAYS
UV radiation is classified into three primary
types: ultraviolet A (UVA), ultraviolet B (UVB),
and ultraviolet C (UVC), based on their
wavelengths. Almost all of the UV radiation that
reaches earth is UVA though some UVB
radiation reaches earth. UVA and UVB
radiation can both affect health but UVA
penetrates deeper into the skin and is more
constant throughout the year.

6. Characteristics and
Properties of UV Rays

7. Characteristics of UV
Rays
Ultraviolet (UV) light has shorter wavelengths
than visible light. Although UV waves are
invisible to the human eye, some insects, such
as bumblebees, can see them. This is similar to
how a dog can hear the sound of a whistle just
outside the hearing range of humans.

8. Properties of UV Rays
Properties of ultraviolet waves:
UV wavelengths are shorter than visible light wavelengths.
UV rays could be blocked by thick clouds.
Throughout hospitals as well as laboratories, UV lights are used to
disinfect.
The near-ultraviolet spectrum seems to be the most similar to visible
light.
The far-ultraviolet area is located between the near and severe
ultraviolet zones.

9. Advantages and
Disadvantages of UV RAYS
Benefits of UV Rays
TUV light technology kills bacteria, germs, mold spores, and viruses.
Depending on the UVC device, the technology can eradicate bacteria and viruses in the air
and on surfaces, including airborne pathogens and airborne particles.
UVC has been used for at least four decades for its effective disinfection properties.
UV technology is available in all different types of devices so it can be easily incorporated
into your cleaning schedule. This includes mobile units, air purification light fixtures, and
heating, ventilation, and air conditioning (HVAC) UV light devices.
Although UVC is unsafe for human exposure due to its potential to damage the eye cornea, it
can be safely added to your facility’s daily disinfection routine.
Mobile units move from room to room using ultraviolet light to kill bacteria and viruses in the air
and on surfaces. Air purification devices work to purify your facility’s indoor air by UV radiation at
the location where you install them. UVC light devices used on your HVAC system sterilize the air
as it moves through the HVAC unit and improves your building’s indoor air quality.

10. Benefits of UV RAYS
The production of vitamin D, a vitamin essential to human health.
Vitamin D helps the body absorb calcium and phosphorus from food and assists
bone development. The World Health Organization (WHO) recommends 5 to 15
minutes of sun exposure 2 to 3 times a week.

11. Disadvantages of UV
Rays

12. Risks of UV RAYS
Sunburn is a sign of short-term overexposure, while premature aging and skin
cancer are side effects of prolonged UV exposure.
UV exposure increases the risk of potentially blinding eye diseases, if eye
protection is not used.
Overexposure to UV radiation can lead to serious health issues, including
cancer.
Skin cancer is the most common cancer in the United States. The two most
common types of skin cancer are basal cell cancer and squamous cell
cancer. Typically, they form on the head, face, neck, hands, and arms
because these body parts are the most exposed to UV radiation. Most cases
of melanoma, the deadliest kind of skin cancer, are caused by exposure to
UV radiation.

13. Applications and Uses of
UV Rays

14. Applications
and Uses of
UV Rays
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2
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UV rays or also known as Ultraviolet
radiation is widely used in industrial
processes and in medical and dental
practices for a variety of purposes,
such as killing bacterias,creating
fluorescent effects,curing inks and
resins, phototherapy and suntanning.
UV rays are used in a wide
range,ranging from medical therapy
to photography
UV rays have been used to sterilize the
air in certain environments since about
1900 and have been used for decades
to help reduce the growth of airborne
pathogens as well as surfaces in
laboratories,health centers.

15. SHORT QUIZ :0
Ultraviolet (UV) light has longer wavelengths than visible light.
There are three types of UV RAYS. (UVA, UVC, UVD)
The World Health Organization (WHO) recommends 5 to 15
minutes of sun exposure 2 to 4 times a week.
UV light technology kills bacteria, germs, mold spores, and viruses.
Most of the ultraviolet radiation in sunlight is absorbed by oxygen
in Earth’s atmosphere, which forms the ozone layer of the lower
stratosphere. Of the ultraviolet that does reach Earth’s surface,
almost 90 percent is UVA radiation.
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