Transient Optical Phenomena in Quartz Fibers under High-Power Pulsed Reactor Irradiation.

Demenkov, P. V.; Plaksin, O. A.; Stepanov, V. A.; Stepanov, P. A.; Chernov, V. M.

Measurements of the intensity of emission and induced optical absorption at 400-750 nm in KU-1 quartz fibers were performed under pulsed irradiation in a BARS-6 reactor (pulse duration, 80 µs; dose per pulse, up to 5 × 10[sup 12] neutrons/cm² (E > 0.2 MeV); dose rate, up to 10[sup 5] Gy/s). The nondelayed emission component is due to the Cerenkov radiation, the weak relaxation component has a relaxation time of ∼ 150 ± 50 µs, and the radiation-induced optical absorption reaches a value of 2.5 × 10[sup -4] cm[sup -1] (relaxation time, 600-1200 µs). A nonlinear dependence of the Cerenkov radiation on the dose rate and the presence of the relaxation emission component and the transient optical absorption may be associated with an optical inhomogeneity of glass induced by the high-power reactor irradiation.

QUARTZ fibers; TRANSIENTS (Dynamics); PULSED radiation

Technical Physics Letters, 2000, Vol 26, Issue 3, p239

1063-7850

Academic Journal

10.1134/1.1262804