In situ measurements of optical parameters in Lake Baikal with the help of a Neutrino telescope
1999
We present results of an experiment performed in Lake Baikal at a
depth of ∼1 km. The photomultipliers of an underwater neutrino
telescope under construction at this site were illuminated by a distant
laser. The experiment not only provided a useful cross-check of the
time calibration of the detector but also allowed us to determine
inherent optical parameters of the water in a way that was
complementary to standard methods. In 1997 we measured an
absorption length of 22 m and an asymptotic attenuation length of
18 m. The effective scattering length was measured as 480
m. By use of 〈cos θ〉 = 0.95 (0.90) for the average
scattering angle, this length corresponds to a geometric scattering
length of 24 (48) m.
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