By Karel van der Toorn

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The critical sources are outgassing and permeation. Leaks can be reduced to negligible levels using good assembly techniques. , 1966). Several computer programs, such as that described by Santeler (1987), are available for more precise calculation. LEAK DETECTION IN VACUUM SYSTEMS Before assuming that a vacuum system leaks, it is useful to consider if any other problem is present. The most important tool in such a consideration is a properly maintained log book of the operation of the system. This is particularly the case if several people or groups use a single system.

A system that is used for the hydrogen isotopes deuterium or tritium will also give a false signal because of the presence of D2 or HT, both of which have their major peaks at mass 4. In such systems an alternate probe gas such as argon must be used, together with a mass spectrometer which can be tuned to the mass 40 peak. Finally, if a leak is found in a system, it is wise to fix it properly the first time lest it come back to haunt you! LITERATURE CITED Alpert, D. 1959. Advances in ultrahigh vacuum technology.

Sci. Instr. 31:343–344. Harra, D. J. 1976. Review of sticking coefficients and sorption capacities of gases on titanium films. J. Vac. Sci. Technol. 13: 471–474. Redhead, P. , Hobson, J. , and Kornelsen, E. V. 1968. The Physical Basis of Ultrahigh Vacuum AVS Classic Series in Vacuum Science and Technology. Springer-Verlag, New York. Hoffman, D. M. 1979. Operation and maintenance of a diffusionpumped vacuum system. J. Vac. Sci. Technol. 16:71–74. Reimann, A. L. 1952.

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