铷原子钟物理部分的低剂量率辐射效应研究

Investigation on the Radiation Effect of Rubidium Atomic Clock by Low Dose Rate

铷原子钟物理部分是铷原子钟的原子鉴频器,决定铷原子钟的短期和长期稳定度(1s以上),其中使用了金属铷、玻璃、镍铁合金等材料和一些双极性晶体管、运算放大器等器件,其核心部件铷泡是一个采用特殊真空工艺制造的器件,这些材料、器件和工艺的低剂量率辐射效应需要实验评价。本文提出并完成了铷原子钟物理部分的低剂量率辐射实验,采用Co60γ源,辐射剂量率0.01rad(Si)/s,总剂量50krad(Si),对铷原子钟物理部分和铷泡的辐射效应分别进行了实验评估。这项研究更加真实地逼近了空间的电离辐射,实验数据对于星载铷原子钟的在轨运行监测和下一代星载铷原子钟的抗辐射设计具有重要的作用。

The physics part is the frequency discriminator for the rubidium atomic clock,which determines its stability specifications including the short term and long term stability specifications（above 1 second）.In physics part,the rubidium metal,glass and ferronickel are adopted,and some bipolar transistors and operational amplifiers are also adopted,the kernel component-rubidium bulb,was especially manufactured by a special vacuum technology.So the low dose rate sensitivity for these materials,devices and technology is essential to be estimated.The radiation experiment by low dose rate was advanced for the physics part of the rubidium atomic clock and the rubidium bulb used in it.The radiation source is Co60 γ,the dose rate is 0.01rad（Si）/s,and the total dose is 50krad（Si）.This work realistically simulates the ionization damage for these products,and the results will be referenced for the rubidium atomic clocks in the orbit and be useful to the radiation harden design for the later rubidium atomic clocks.