Causes of Radiation Pollution. The radiation pollution causes are various human activities, that add to natural radiation background (radiation produced everywhere in the Universe in absence of human activities).
You do not need to have any witnesses or have it notarized, but you can do both if you want. Your holographic will should include: 1  your full name and any other names you have used, 2  your place of residence, 3  a statement that the document is your will,  your marital status,
Sputtering deposition usually uses an argon plasma because argon, a noble gas, will not react with the target material. ===Etching=== In the semiconductor industry sputtering is used to etch the target. Sputter etching is chosen in cases where a high degree of etching anisotropy is needed and selectivity is not a concern.