Tuesday, December 10, 2013



Krypton-85



Krypton-85 is a radioisotope of krypton, simply meaning it is a radioactive isotope. This specific isotope will decay into stable rubidium-85. It has 36 protons, 36 electrons, and 48 neutrons, with a mass number of 85. It is found in the atmosphere as a gas or can be a by-product in nuclear explosions, volcanoes, earthquakes, and more. Properties are: tasteless, odorless, colorless, and produces some beta and gamma rays. It belongs to the group of noble gases and has a lot of uses.

Krypton-85 is used for leak detection, plasma displays, light bulbs, spark gaps and more! The leak detection method is used on a lot of things, varying to cars, to silicon MEMs (Micro-Electro-Mechanical Systems). Whatever they are testing is placed into a pressurized room with a air mixture containing krypton-85. If krypton is able to make its way into the object, it has a leak in it. This method was developed in the 1950s.



Video on krypton-85: http://www.youtube.com/watch?v=Y2CAmZ_Uk4w

Work sited
 "Chemistry Explained." Krypton, Chemical Element. N.p., n.d. Web. 08 Dec. 2013.
"Krypton-85 Radioisotope Leak Testing." Krypton-85 Leak Testing Method. N.p., n.d. Web. 10 Dec. 2013.
"Krypton-85." Lindepremiumproducts. N.p., n.d. Web. 10 Dec. 2003.
"College of Engineering." Penn State Department of Architectural Engineering. N.p., n.d. Web. 10 Dec. 2013.



In this diagram, air is supplied to the isolation room and exhausted from both the isolation room and the ante room.
Diagram of a pressurized room




Bohr model of krypton-85

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