光纤快中子辐照与伽马辐照的比较

RADECS 97. Fourth European Conference on Radiation and its Effects on Components and Systems (Cat. No.97TH8294) Pub Date : 1997-09-15 DOI:10.1109/RADECS.1997.698960

H. Henschel, O. Kohn, W. Lennartz, S. Metzger, H. U. Schmidt, J. Rosenkranz, B. Glessner, B. Siebert

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引用次数: 25

摘要

用14兆电子伏特的中子和60/Co的伽马射线辐照多种未掺杂的多模阶梯折射率纤维和锗掺杂的单模和梯度折射率纤维，总剂量相同。测量了辐射损耗和断裂应力。在相同剂量率下，掺锗光纤的γ辐照损耗比中子辐照约高2.5倍，影响约为3/spl倍/10/sup 12/ cm/sup -2/ (14 MeV)。在约10/sup 13/ cm/sup -2/ (14 MeV)后，损耗比降至/spl / les/2.0。用蒙特卡罗方法计算了含h丙烯酸酯涂层中快速反冲质子所引起的剂量增强。14 MeV /spl / /10/sup / 13/ cm/sup -2/ /的中子辐照似乎使纤维断裂应力降低了3-4%，而相同总剂量的/sup 60/Co γ辐照则没有效果。

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Comparison between fast neutron and gamma irradiation of optical fibres

A variety of undoped multimode step-index fibres and Ge-doped single mode and graded index fibres is irradiated by 14 MeV neutrons and /sup 60/Co gamma rays up to the same total dose. Radiation-induced loss and breaking stress are measured. The loss induced during gamma irradiation of Ge-doped fibres is about 2.5 times higher than during neutron irradiation with the same dose rate, up to a fluence of about 3/spl times/10/sup 12/ cm/sup -2/ (14 MeV). This loss ratio decreases to /spl les/2.0 after about 10/sup 13/ cm/sup -2/ (14 MeV). Monte Carlo calculations of the dose enhancement as caused by fast recoil protons out of the H-containing acrylate coating are confirmed experimentally. 14 MeV neutron irradiation up to /spl les/10/sup 13/ cm/sup -2/ seems to decrease fibre breaking stress by 3-4%, whereas /sup 60/Co gamma irradiation up to the same total dose has no effect.

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RADECS 97. Fourth European Conference on Radiation and its Effects on Components and Systems (Cat. No.97TH8294)

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