Model for the Dose, Dose-Rate and Temperature Dependence of Radiation-Induced Loss in Optical Fibers

IEEE Transactions on Nuclear Science

Volumn 41, Issue 3, 1994, Pages 523-527

  Griscom, D L ^a   Gingerich, M E ^a   Friebele, E J ^a  

^a NAVAL RESEARCH LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

DOPING (ADDITIVES); DOSIMETRY; ELECTROMAGNETIC WAVE ATTENUATION; GAMMA RAYS; LIGHT ABSORPTION; MATHEMATICAL MODELS; MOLECULAR PHYSICS; OXYGEN; RADIATION EFFECTS; RECOVERY; SILICA; THERMAL EFFECTS;

BIMOLECULAR KINETICS; BIMOLECULAR RECOMBINATION; DOSE RATE; POWER LAW; RADIATION INDUCED LOSSES;

OPTICAL FIBERS;

EID: 0028446095     PISSN: 00189499     EISSN: 15581578     Source Type: Journal    
DOI: 10.1109/23.299793     Document Type: Article

References (20)

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14. Ref. 6 treats radiation-induced defects detected by electron spin resonance in bulk NaPO 3 and Ca(PO 3 ) 2 glasses and reports dose-dependent recovery rates potentially interpretable by the present theory. Although the authors of Ref. 6 described their growth curves as having an initial “linear dose dependence", the straight-line slopes scaled from the illustrated log-log log plots were f=0.85 and 0.75, for the respective glasses, i.e., they were power laws.
15. In principle, the true kinetic order can be deduced from the dependence of the growth curves on dose rate, D. Assuming, as we have done in the present analysis, that K i and R i are independent of D and further that f is empirically found to be independent of D, eq. (7) predicts C∝D (1-f)/n or, for the case n=2, C∝D (1-f)/2. At this writing, we have insufficient D-dependence data (at a fixed temperature) to test this prediction.
16. The roller-coaster natures of the predicted curves result from the crude approximation of using of just three subpopulation components, corresponding to the nominal mean K i value, K mean, plus the components 3K mean and (1/3)K mean.
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20. The present analysis correctly predicted the half life (τ in eq. (11)) in all cases except for the highest-dose-rate data of Fig. 3. The factor-of-2 discrepancy between the experimental and predicted values of τ evident in Fig. 6 (squares) is tentatively ascribed to the continuous curvature (as opposed to straight-line behavior) mani-fested in the corresponding log-log growth curve of Fig. 3(a). Indeed, this curvature may be due to a breakdown at very high dose rates in the assumption that R i is independent of D.