Background light measurements in the deep ocean.

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Tytuł:: Background light measurements in the deep ocean.
Autorzy:: Aoki, T.
Kitamura, T.
Matsuno, S.
Mitsui, K.
Ohashi, Y.
Okada, A.
Cady, D.
Learned, J.
O'Connor, D.
Dye, S.
Gorham, P.
McMurdo, M.
Mitiguy, R.
Webster, M.
Wilson, C.
Grieder, P.
Źródło:: Il Nuovo Cimento: C; 1986, Vol. 9 Issue 2, p642-652, 11p
Abstract (English):: Ambient light intensities in the ocean at depths between 1500 m and 4700 m near Hawaii Island were measured around the one photoelectron level with 5″ diameter hemispherical photomultipliers. Measurements of count rates above variable thresholds were carried out in ship-suspended and bottom-tethered configurations. The ship-suspended rates show considerable fluctuation and their mean value decreases with depth approximately as exp [− x(m)/877]. The bottomtethered rates are about an order of magnitude lower than the ship-suspended rates and show little fluctuation. The calibration of our instrument indicates an absolute flux at 4700 m depth based on the bottom-tethered measurement of 218 photons/cm·s, which is consistent with calculated intensities due to β-decay electrons fromK. The difference in the two cases is attributed to bioluminescence due to environmental stimulation. [ABSTRACT FROM AUTHOR]
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