Radiation Damage Effects
Radiation-induced attenuation of glass and fibre as a power law of dose, A₁D^f: induced loss in dB/m and dB, internal transmission, and the dose that uses up a loss budget.
Enter A₁ and f fitted to measured induced loss for your glass or fibre at your wavelength, dose rate and temperature. The defaults are an example, not a material value.
Induced Attenuation
3.162 dB/m
A₁D^f; 0.7281 m⁻¹ (natural log)
Induced Loss over the Path
0.03162 dB
1.00 kGy = 1.00e+5 rad
Internal Transmission
99.27 %
10^(−loss/10), induced loss only
Dose at the Loss Budget
1.00 MGy
(budget/(A₁L))^(1/f) for 1 dB
Internal transmission against dose
- Internal transmission
- Your dose
Model
A(D) = A₁ D^f, 0 < f ≤ 1
loss = A L; T_int = 10^(−A L/10)
Illustrative: a power law describes many measured growth curves of radiation-induced loss at one dose rate, temperature and wavelength, with f below 1 as the colour centres saturate (Griscom, Gingerich and Friebele 1994). A₁ varies by orders of magnitude between glasses and fibres, so no material presets are given. Recovery after the exposure, dose-rate and temperature effects, and refractive-index changes are not modelled.
Model and references
Illustrative. A simplified model that shows trends and orders of magnitude. Don't use its numbers for design. About the tiers
A(D) = A₁D^f with 0 < f ≤ 1, fitted per glass, wavelength, dose rate and temperature; no material presets. Recovery after exposure, dose-rate and temperature effects and index changes are not modelled.
- Griscom D. L., Gingerich M. E., Friebele E. J. (1994). Model for the dose, dose-rate and temperature dependence of radiation-induced loss in optical fibers. IEEE Trans. Nucl. Sci. 41, 523–527. doi:10.1109/23.299793