The addition of Chromium and Nickel to the iron creates a significant percentage of Chromium and Nickel items at the surface.These atoms form tenacious oxides that mask the surface and prevent oxidation of the iron. The process known as passivation for stainless steel, is a common means of improving this protective oxide layer through the use of oxidizing acids.The corrosion resistance of stainless steel depends on the Chromium.
Why does manufacturers coat inner walls of BF3 counters with activated charcoal?
The charcoal coating is used for tubes filled with BF3 gas and also for He3 filled counters operated in high neutron fluxes. The activated charcoal serves to absorb electronegative gases that build up during nuclear irradiation.
For instance, in a BF3 filled detector three fluorine atoms are released with each neutron capture.The Fluorine atoms will combine with electrons released in subsequent neutron captures. Initially, this process reduces electric pulse amplitude and eventually output pulses are eliminated altogether.
For instance, in a BF3 filled detector three fluorine atoms are released with each neutron capture.The Fluorine atoms will combine with electrons released in subsequent neutron captures. Initially, this process reduces electric pulse amplitude and eventually output pulses are eliminated altogether.
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