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An acoustical shield, often mounted on the machine, can provide 8 to 10 dB of noise reduction under the following circumstances: the worker is near the noisy operation; the smallest dimension of the shield is at least three times the wavelength of the dominant noise; and the ceiling above the machine is covered with sound-absorptive material.
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Bruce Dickson and Geoffrey Taylor (1998). Noise reduction of aerial gamma-ray surve. CSIRO Exploration & Mining, PO Box 136, North Ryde, NSW 2113.
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