Service environment conditions exert continuous and substantial influence on the shielding effectiveness of tungsten alloy shielding containers throughout their operational life, primarily encompassing temperature field, humidity and chemical media, mechanical loading, cumulative irradiation, and accidental scenarios.
Temperature variation induces minor thermal expansion and binder-phase diffusion; elevated temperature environments may accelerate surface oxidation or coating aging, while low temperature tests sealing material embrittlement risk. Humidity and chemical media (decontamination agents, waste liquids, salt mist) pose long-term challenges to surface passivation films and functional coatings, with strongly oxidizing or acidic environments potentially causing slight surface corrosion or reduced coating adhesion. Mechanical loading includes static stacking, transport vibration, and accidental drops, which may result in minor sealing surface deformation or localized stress concentration, thereby affecting minimum wall thickness and joint shielding continuity.
Long-term cumulative irradiation gradually increases dislocation, interstitial atoms, and activation products; although minimal in high-quality tungsten alloy, potential effects on geometrical stability and background level still warrant attention. Accidental scenarios such as fire-induced high temperature, immersion, or impact serve as the ultimate test of overall environmental adaptability.
Service environment conditions, through interaction with material, structure, and surface treatment, determine the long-term shielding reliability of tungsten alloy containers in nuclear medicine hot cells, isotope production, industrial irradiation, and waste storage applications.
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