Small-scale crucible melting tests on simulated waste glass were performed with technetium-99 (Tc-99) introduced as different species in a representative low activity waste simulant. The glass saw an increase in Tc-99 retention when TcO₂∙2H₂O and various Tc-minerals containing reduced tetravalent Tc were used compared to tests in which pertechnetate with heptavalent Tc was used. We postulate that the increase of Tc retention is likely caused by different reaction paths for Tc incorporation into glass during early stages of melting, rather than the low volatility of reduced tetravalent Tc compounds, which has been a generally accepted idea. Additional studies are needed to clarify the exact mechanisms relevant to the effect of reduced Tc compounds on Tc incorporation into or volatilization from the glass melt.

对tech废玻璃进行小规模坩埚熔化测试，使用tech 99（Tc-99）作为不同种类的代表性低活性废模拟物中引入的introduced。当TcO ₂ ∙2H _2出现时，玻璃的Tc-99保留量增加。与使用高tech酸酯与七价Tc的测试相比，使用了O和各种四价Tc含量降低的Tc矿物。我们推测，Tc保留的增加可能是由于在熔融的早期将Tc掺入玻璃中的反应路径不同，而不是由于还原的四价Tc化合物挥发性低所致，而这一直是人们普遍接受的想法。需要进一步的研究来阐明与还原的Tc化合物影响Tc掺入玻璃熔体或从玻璃熔体中挥发有关的确切机理。