irradiation of US Army
-> a linking of the technology with the military in the minds of the public
1958 World first commercial food irradiation (spices) at Stuttgart, Germany
2. X-rays
They are caused by atomic transitions and they are usually less energetic than gamma rays.
X-rays with varying energies are generated by machines.
→ To produce the X-rays, a beam of electrons
irradiation, and adding preservatives or inert gases such as carbon dioxide. Other methods that not only help to preserve food, but also add flavor, include pickling, salting, smoking, preserving in syrup or alcohol, sugar crystallization and curing.
As the preceding paragraphs say, many kinds of food preservation technologies are around for preventing foods from the undesirable results. Specifi
Who is interested in the process?
Alongside traditional methods of processing and preserving food, the technology of food irradiation is gaining more and more attention around the world. Although regarded as a new technology by some individuals, research on food irradiation dates back to the turn of the century with the first USA and British patents being issued in 1905 for the use of ionizing
Tungsten filament was
heated to generate electron.
Revolving 270, the electrons
are directed by
electromagnetic field
resulting collision onto the
source surface
After heated to certain
degree, source gas was
generated
The sensor monitors the
thickness of deposited film.
High vacuum should be kept in
the chamber not to contain
oxigen
gas which damages
substrat
Beam Epitaxy:분자선 에피택시)법이나 MOCVD(Metal Organic CVD:유기금속 소스를 이용한 기사성장)법에 의해 형성된다. AlGaAs와 GaAs의계면에는 헤테로 접합 즉, 이종 접합이 형성된다. 헤테로 접합에서는 여러 가지 재료의 조합을 생각할 수 있지만, 대표적인 것으로는 GaInAs와 AlInAs 또는 Si와 Si-Ge가 있다. N형 반도