Gamma rays are a form of electromagnetic radiation emitted from radioactive decay processes. They have short wavelengths between 10-5 to 0.1 nm and high frequencies between 1020-1025 Hz. Gamma rays were discovered in 1900 by Paul Ulrich Villard and occur naturally from processes like nuclear fusion and electron-positron annihilation. They are used in medicine for radiography, CT scans, and gamma knife surgery. Gamma knife surgery uses over 200 concentrated gamma rays to destroy targeted tumor tissue without damaging surrounding brain areas. Gamma rays can also have negative effects if overexposed, like cell damage and infertility.

1. Group 7
Gamma-Ray

3. Definition of Gamma-Ray
 Gamma-ray is a form of radiant
energy from the atom nuclei emission
of radioactive substances or
electromagnetic radiation produced by
radioactivity or nuclear or subatomic
processes such as electron-positron
annihilation
 Gamma-ray is often denoted by the
Greek letter gamma,

4. Frequency Area (Range)
 Gamma-ray has frequencies
between 1020 - 1025 Hz

5. Wave Length
 Gamma-ray wave length ranging is
between 10–5 nm to 0.1 nm

6. The Occurrence of Gamma-
Ray
Gamma-ray ( ) is resulted from the destruction of the merger
process of two high-energy atomic nuclei in atomic nuclei
(gamma decay) and high-energy particle interactions of sub-
atomic in natural processes and man made mechanisms.

7. Another process of the gamma-ray formation is
electron-positron annihilation, shedding of neutral pion,
fusion, fission, lightning, and terrestrial gamma-ray
flashes, also astronomical sources where electrons high-
energy are generated. These electrons then produce
secondary gamma-ray.

8. Inventor
Gamma-ray was discovered by the
French chemist and physicist, Paul
Ulrich Villard in 1900, when he was
reviewing Uranium. Working in the field
of chemistry at the Ecole Normale
Superieure, Paris, he finds that
gamma-ray can not be deflected by
magnetic fields.

9. Application of Gamma-Ray
 Used in radiographic techniques, it is shooting
inside an object. The captured were recorded in
the X-ray
 Used in medicine, namely CT-Scanner
(Computed Tomography Scanner)
 Used to cure cancer with Gamma-Knife Surgery
 Used in the sterilization process for biological
tissue products
 Used to process plant breeding with mutations
techniques in BATAN
 Used as nuclear weapons
 Used to create a sterile insects.
 Used to kill bacteria and viruses in crops and

10. Gamma Knife Surgery
Gamma-knife is a 'knife' surgery that uses a gamma-
ray to cut or destroy tissue, because it actually does not
use real knives then called knifeless surgery. It is known
that the gamma-ray is used in radiation treatment
(radiotherapy) to destroy cancer and other disorders.

11. The Process of Gamma Knife
Surgery
201 radioactive beam were
focused on the target
(cancer cells to be
removed) to the brain to be
treated through a metal
helmet. Each beam has a
small effect on brain cells
in its path, but it has a fairly
large dose of radiation to
the target location where
all beams were met.

12. Sample of Questions
1. Velocity ​​of the wave in vacuum is 3.108 m/s. Determine the
frequency of gamma-ray (λ = 1.10-4 nm)!
Known:
v = 3.108 m/s
λ = 1.10-4 nm
Asked:
f = ?
Answered:
f =
v
λ
f =
3 x108
1 x10− 4
x10−9
f = 3 x1021
Hz

13. 2. What are the negative effects of the gamma-ray
using?
Answered:
 Can cause infertility
 Can cause damage to cells/tissues of human
life
 Can cause burns

14. 3. How do gamma-ray from radioactive substances
work in the body?
Answered:
Gamma-ray is excited (damage protein
component in our bodies in a way to destroy it).
Excitation here is gamma-ray agglutinate proteins
in each cell. When clots are bigger then the cells
will be destroyed and out in the form of proteins
called protein denaturation (non-specific
clumping). If the beam continuously in the body, as
a result the body becomes rupture and clot
continuously.

15. Conclusion
 Gamma-ray is a form of energy that has
frequencies between 1020 - 1025 Hz and wave
length ranging is between 10–5 nm to 0.1 nm
 Gamma-ray was discovered by the French chemist
and physicist, Paul Ulrich Villard in 1900, when he
was reviewing Uranium.
 The application of gamma-ray is in medicine,
agriculture, weaponry.

16. Bibliography
 http://id.wikipedia.org/wiki/Sinar_gamma
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physics.org/physics180/physics180B/Topics/electromagnetism/images_em/em_sp
ectrum5.gif
 http://en.wikipedia.org/wiki/Gamma_ray
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elektromagnetik.html
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dan.html
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gelombang-elektromagnetik-dalam-kehidupan/
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 http://id.shvoong.com/exact-sciences/physics/2310506-fisika/
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elektromagnetik.html
 http://kliktedy.wordpress.com/2009/10/20/radioaktivitas-sinar-gamma/
 http://vespaungu.wordpress.com/2012/04/25/gamma-knife-dan-pengenalannya/
 http://gammaknifeindonesia.com/id/2012/04/11/gamma-knife-metode-bedah-otak-