Definition of Wave

Electromagnetic Wave

Kind of Waves Frequency Range

Definition of

Gamma Rays

InventorOf

Gamma Rays

Properties of

Gamma Rays

How Gamma Rays are produced

DEFINITION of WAVE

Wave is the propagation of vibration or disturbance

symptoms from one location to another by transferring

energy.

KIND of WAVE

0Based on their medium :

1. Mechanical waves

2. Electromagnetic wave

0Based on the direction of vibration against the direction of its propagation :

1. Tranverse waves

2. Longitudinal waves

ELECTROMAGNETIC WAVE

0 Electromagnetic wave is the propagation symptom ofelectric and magnetic fields which are perpendicular toeach other and change periodically

0 Electomagnetic waves :

- radio waves

- mikrowave

- Infrared rays

- Visible light

- Ultarviolet rays

- X-ray

- Gamma Rays

DEFINITION of GAMMA RAYS

Gamma rays ( often denoted by the Greek lettergamma, γ) is an energetic form of electromagneticradiation produced by radioactivity or nuclear orsubatomic processes such as electron-positrondestruction.

INVENTOR of GAMMA RAYS

Paul Ulrich Villard, a French chemist andphysicist, 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 notconsider naming them as a different

fundamental type.

FREQUENCY RANGE0Gamma rays

• Wavelength : 10-11 meter - 10-14 meter

• Frequency : 1018 - 1022 Hz

0Gamma rays are electromagnetic wave which have thethe highest frequency and the shortest wave

0This wave has the big energy and can through metaland concrete

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 The penetration of very large0 It can not be deflected by electric and magnetic fields0 Has the shortest wavelength0 Energy is very large and very destructive0 Less ionize

How Gamma Rays Produced

Gamma rays can be produced in labs through theprocess of nuclear collision and also through theartificial radioactivity that accompanies theseinteractions. The high-energy nuclei needed for thecollisions are accelerated by devices such as thecyclotron and synchrotron.

USES of GAMMA RAYS0 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 canharm 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 weakpoints. The rays pass through the metal and darken a photographic film at places opposite theweak points. In industry, gamma rays are used for detecting internal defects in metal castingsand in welded structures. Gamma rays are used to kill pesticides and bugs in food. Gamma raysare also used in nuclear reactors and atomic bombs.

0 Consumer goods

Gamma rays are often used in the food industry. The radioisotopes preserve foods. Althoughthe rays never come in contact with food, beta radiation kills various organisms, such asbacteria, yeast, and insects.

0 Science

Gamma rays can be used to detect beryllium. They also played a very important role in thedevelopment of the atom bomb.

DANGERS of GAMMA RAYS

Gamma rays bombard our bodies constantly.They come from the naturally radioactive materials inrocks and the soil. We take some of these materialsinto our bodies from the air we breathe and the waterwe drink. Gamma rays passing through our bodyproduce ionization in tissue. High levels of gammarays can produce dangerous ionization of the tissueand can cause skin cancer.

What is the difference between gamma rays and X-rays ?

The key difference between gamma rays and X-raysis how they are produced. Gamma rays originate fromthe nucleus of a radionuclide after radioactive decaywhereas X-rays are produced when electrons strike atarget or when electrons are rearranged within anatom. Cosmic rays also include high-energy photons andthese are also called gamma-rays whether or not theyoriginated from nuclear decay or reaction.

CONCLUSION

Gamma ray is an electromagnetic waves which have :

The shortest wavelenght, and

The highest frequency