A few types of flint glasses intended for use in achromat lenses of optical diagnostics in ITER were tested recently in a nuclear reactor and demonstrated sufficient resistance to fast neutron fluences from 10¹² to 10¹⁶ n/cm². However, there is an evidence that some flint grades may have significant transient radiation-induced absorbance whereas post-irradiation measurements do not reveal any degradation. Though the effect of the short-term absorbance has been discovered at much higher gamma dose rate than it is expected in the port cell, the possible transient effect of gamma irradiation on the candidate flint types should be checked. Two grades of candidate radiation-resistance flints (F108 and TF200) for H-alpha and Visible spectroscopy were irradiated in the Co-60 gamma source at the dose rate of ~10⁻² Gy/s with in-situ monitoring of their relative transparency. As a result, none of the tested samples has demonstrated significant transient absorption. The slight transmittance decrease of F108 sample was almost fully recovered in a few hours after the irradiation. The TF200 samples preserved their properties within the measurement accuracy. The results prove that the both F108 and TF200 flints can be used for diagnostic optics in ITER.

最近，在核反应堆中测试了几种类型的用于ITER光学诊断的消色差透镜的of石玻璃，它们显示出对10 ¹²至10 ¹⁶ n / cm ^2的快速中子通量具有足够的抵抗力。。但是，有证据表明，某些火石等级可能具有明显的瞬态辐射诱导的吸光度，而辐照后的测量结果却没有发现任何降解。尽管已发现在比门禁单元格预期的伽玛剂量率高得多的伽玛剂量率下，短期吸收的影响，但应检查伽玛射线对候选火石类型的可能瞬时影响。在Co-60γ源中以〜10 ^-2的剂量率辐照了用于H-alpha和可见光谱的两种等级的抗辐射火石（F108和TF200）Gy / s，并对其相对透明度进行现场监控。结果，所有测试样品均未显示出明显的瞬态吸收。辐照后几小时内，F108样品的透光率略有下降，几乎可以完全恢复。TF200样品在测量精度范围内保留了其特性。结果证明，F108和TF200火石均可用于ITER中的诊断光学。