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Record Details

Record 93 of 7731
Prolonged triboluminescence in clays and other minerals
Author and Affiliation:
Lahav, N.(NASA Ames Research Center, Moffett Field, CA, United States)
Coyne, L. M.(NASA Ames Research Center, Moffett Field, CA, United States)
Lawless, J. G.(NASA Ames Research Center, Moffett Field, CA, United States)
Abstract: Samples of various clays and minerals were ground or fractured and monitored with a liquid scintillation spectrometer in order to obtain triboluminescent decay curves. Kaolinite samples displayed several million counts/min after grinding, with a surface area emission estimated at tens of billions of photons/sq cm of surface. The photon production rates varied with the origin of the sample, and kaolinite continually yielded higher production rates than bentonite. The addition of water to the samples slightly increased the count rate of emitted light, while the addition of the fluorescent molecule substance tryptofan significantly enhanced the count rate. Freezing smears of kaolinite and montmorillonite in liquid nitrogen and in a salt ice mixture also induced triboluminescence in the montmorillonite. A possible connection between powdery triboluminescent materials formed in mining industries and respiratory disorders among miners is suggested.
Publication Date: Jan 01, 1982
Document ID:
19820046760
(Acquired Nov 30, 1995)
Accession Number: 82A30295
Subject Category: GEOPHYSICS
Document Type: Journal Article
Publication Information: Clays and Clay Minerals; 30; 1, 19; 1982
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
Description: 3p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CLAYS; LUMINESCENCE; MINERALS; BENTONITE; FREEZING; GRINDING (COMMINUTION); KAOLINITE; RESPIRATORY DISEASES
Imprint And Other Notes: Clays and Clay Minerals, vol. 30, no. 1, 1982, p. 73-75.
Miscellaneous Notes: p. 73-
Availability Source: Other Sources
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