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Radiation-Induced Outgassing from Type 304 Stainless Steel

T. P. Toepker, J. N. Anno

Nuclear Technology

Volume 46 / Number 1 / November 1979 / Pages 127-133


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A Type 304 stainless-steel vacuum system has been designed and constructed to study radiation-induced outgassing when this material is exposed to 60Co gamma radiation. An analytical model has been developed that predicts the outgassing from Type 304 stainless steel to be 5 X 10-10 Paℓ/cm2 . s per Mrad/h. Experiments determined the value for Type 304 stainless steel after bakeout at 300°C to be (1.03 ± 0.58) X 10-9 Pa ℓ/cm2 s per Mrad/h, in fair agreement with the analytical model predictions. Studies on thermally induced outgassing from Type 304 stainless steel showed that after bakeout at temperature T*, thermal outgassing ∆ obeys the relationship ∆ = ∆0 exp(∼Q/RT), where both the constant ∆0 and the average desorption energy Q are functions of T*. Water vapor and hydrogen were the principal residual gases in a Type 304 stainless-steel vacuum system, with hydrogen being dominant at low pressures after bakeout.

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