2. Definition of Wave
Inventor
Of
Gamma Rays
Properties
of
Gamma Rays
How Gamma Rays are
produced
Kind of Waves
Electromagnetic Wave
Frequency Range
Definition
of
Gamma Rays

3. DEFINITION of WAVE
Wave is the propagation of vibration or disturbance
symptoms from one location to another by transferring
energy.

4. KIND of WAVE
0 Based on their medium :
1. Mechanical waves
2. Electromagnetic wave
0 Based on the direction of vibration against the
direction of its propagation :
1. Tranverse waves
2. Longitudinal waves

5. ELECTROMAGNETIC WAVE
0 Electromagnetic wave is the propagation symptom of
electric and magnetic fields which are perpendicular to
each other and change periodically
0 Electomagnetic waves :
- radio waves
- mikrowave
- Infrared rays
- Visible light
- Ultarviolet rays
- X-ray
- Gamma Rays

6. DEFINITION of GAMMA RAYS
Gamma rays ( often denoted by the Greek letter
gamma, γ) is an energetic form of electromagnetic
radiation produced by radioactivity or nuclear or
subatomic processes such as electron-positron
destruction.

7. INVENTOR of GAMMA RAYS
Paul Ulrich Villard, a French chemist and
physicist, discovered gamma radiation in
1900, while studying radiation emitted
from radium. Villard knew that his described
radiation was more powerful than previously
described rays from radium, but did not
consider naming them as a different
fundamental type.

8. FREQUENCY RANGE
0 Gamma rays
• Wavelength
• Frequency
: 10-11 meter - 10-14 meter
: 1018 - 1022 Hz
0 Gamma rays are electromagnetic wave which have the
the highest frequency and the shortest wave
0 This wave has the big energy and can through metal
and concrete

9. PROPERTIES OF GAMMA RAYS
0 Sources
: radio-isotopes, nuclear reactions, the core an
unstable atom
0 Description : Electromagnetic radiation
0 Energy
: up to a few MeV
0 Permeability : a very large
0 Wavelength : 10-11 to 10-14 m
0 Gamma rays have the shortest wavelength and highest frequency of all EM
radiation
0 Didn’t have a mass
0 Gamma rays are produced in areas of extremely high temperature, density
and magnetic fields
0
0
0
0
0
The penetration of very large
It can not be deflected by electric and magnetic fields
Has the shortest wavelength
Energy is very large and very destructive
Less ionize

10. How Gamma Rays Produced
Gamma rays can be produced in labs through the
process of nuclear collision and also through the
artificial radioactivity that accompanies these
interactions. The high-energy nuclei needed for the
collisions are accelerated by devices such as the
cyclotron and synchrotron.

11. USES of GAMMA RAYS
0 Medicine
Gamma rays are used in medicine to kill and treat certain types of cancers and tumors.
Gamma rays passing through tissue of the body produce ionization in tissue. Gamma rays can
harm the cells in our body. The rays can also detect brain and cardiovascular abnormalities.
0 Industry
Gamma rays can be used to examine metallic castings or welds in oil pipelines for weak
points. The rays pass through the metal and darken a photographic film at places opposite the
weak points. In industry, gamma rays are used for detecting internal defects in metal castings
and in welded structures. Gamma rays are used to kill pesticides and bugs in food. Gamma rays
are also used in nuclear reactors and atomic bombs.
0 Consumer goods
Gamma rays are often used in the food industry. The radioisotopes preserve foods. Although
the rays never come in contact with food, beta radiation kills various organisms, such as
bacteria, yeast, and insects.
0 Science
Gamma rays can be used to detect beryllium. They also played a very important role in the
development of the atom bomb.

12. DANGERS of GAMMA RAYS
Gamma rays bombard our bodies constantly.
They come from the naturally radioactive materials in
rocks and the soil. We take some of these materials
into our bodies from the air we breathe and the water
we drink. Gamma rays passing through our body
produce ionization in tissue. High levels of gamma
rays can produce dangerous ionization of the tissue
and can cause skin cancer.

13. What is the difference between gamma
rays and X-rays ?
The key difference between gamma rays and X-rays
is how they are produced. Gamma rays originate from
the nucleus of a radionuclide after radioactive decay
whereas X-rays are produced when electrons strike a
target or when electrons are rearranged within an
atom. Cosmic rays also include high-energy photons and
these are also called gamma-rays whether or not they
originated from nuclear decay or reaction.

14. CONCLUSION
Gamma ray is an electromagnetic waves which have :
 The shortest wavelenght, and
 The highest frequency