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Definition Inventor Figures

Characteristics

How to produce it Application in daily life

Conclusion

Definition of Gamma ray

Gamma rays (γ) are an energetic form of electromagnetic radiation.It has an extremly high frequency and therefore per photon has a high energy. Gamma rays are produced by emitted from the nucleus of some unstable radioactive atoms.

Frequency

• Frequency Range: more than 1020 Hz• Gamma rays have the highest

frequency of all EM radiation.

Wavelength

Gamma rays have the shortest wavelength of all ElectroMagnetic radiation. Wavelength Range: <10-12 m

Inventor Figures

In the end of 1890, Bacquerel discovered radioactivity inadvertently. He covered the uranium salt by using thick black paper and put it on the photographic plate. And then he put it into the drawer without exposed it to sunlight first. A few days later he found that the photographic plate became dark. He speculated that the radiation is stronger than the X ray.

Antoine Henri Becquerel

Gamma ray is discovered by French chemist and physicist, Paul Ulrich Villard  in 1900 while studying the radiation emanating from Radium, Polonium and Uranium. He finds that gamma-ray can not be deflected by magnetic fields.

Inventor Figures

Paul Ulrich Villard

In 1914, Ernest Rutherford and Edward Andrade showed that gamma rays were a form of electromagnetic radiation by measuring their wavelengths using crystal diffraction. The measured wavelengths were similar to those of X-rays and are very short. It was Ernest Rutherford who named gamma rays.

Inventor Figures

Edward Neville da Costa Andrade Ernest Rutherford

Characteristic of gamma ray

• Radiation of short wavelength and high frequency

• Not deflected in a magnetic field

• The greatest energy • The strongest penetration

They are commonly produced by the decay of radioactive materials because of the activity of nucleus such as cobalt-60. And also created by other processes such as supernova explosions, fusion, fission and lightning.

How to Produce Gamma Ray

Application of Gamma-Ray in Daily life

• In industrial section, to find out the structure of metal.

• In agricultural section, to make a superior seed• In nuclear technical, to make an isotop radio • In medical section, for therapy and diagnose• In pharmaceutical section, for sterilization• Food irradiation• In trade section, it is used to control the

security of commodity export

Gamma Ray Container Scanner

Gamma Ray Container Scanner• This device contains radiation source in which there

are cobalt-60, and able to emit radiation at 0.75 curies which can penetrate up to 15–18 cm of steel

• The radiation is caught by the a vertical tower of gamma detector and then translated by VACIS (Vehicle and Cargo Inspections) software application into an image

• The image has an extention .tif and can be annotated by a voice file that has and extention .wav

• And then the image will be analyzed by image analyst

Conclusion• Gamma-ray is the shortest wavelength

and the highest frequency• It produced by the emitted from nucleus of

some unstable radioactive atoms.• Gamma-ray was discovered by the French

chemist and physicist, Paul Ulrich Villard in 1900, when he was reviewing Uranium.

• The function of gamma-ray is in wide range subject such as medicine, agriculture, weaponry, and trade.

Bibliography

http://id.wikipedia.org/wiki/Sinar_gama http://annucigema.blogspot.com/2013/06/penemuan-sinar-gamma.htmlhttp://sibeloy.blogspot.com/2011/06/sinar-gamma.htmlhttp://catatankecik.blogspot.com/2012/09/gamma-ray-alat-pengawasan-ekspor.htmlhttp://www.st-andrews.ac.uk/~bds2/ltsn/ljm/JAVA/SPECTRUM/details.html http://kangtarman.blogspot.com/2013/04/gelombang-elektromagnetik.htmlhttp://pustakafisika.wordpress.com/tag/sejarah-penemuan-radiasi-gamma/http://qwertyjuki.blogspot.com/2012/09/sinar-gamma.htmlhttp://amazing space.stsci.edu/resources/explorations/groundup/lesson/glossary/term-

full.php?t=gamma_rays