Impulse Noise Exposure during Personal Weapons Testing on an Outdoor Shooting Range


  1. Nakashima, A.
  2. Hu, Y.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Noise measurements were taken during Canadian Forces (CF) personal weapons testing using the C7 rifle and the 9 mm pistol. Microphones were placed behind the firing line (where the range safety officer [RSO] is positioned), close to the ears of the shooters and in the butts (protected area from which the targets are manually raised and lowered). The noise was measured for up to six shooters firing at once. The peak levels for the C7 were as high as 155 dB SPL for the shooters, 148 dB SPL for the RSO, and 141 dB SPL in the butts. The peak levels at all three positions exceeded the Occupational Health and Safety Administration (OSHA) impulse noise limit of 140 dB (for unoccluded listening). Over a 4.5 hour measurement period, the approximate integrated noise level (Leq) for the RSO was 97 dBA. For the shooter position and in the butts, the Leq’s were 104 dBA and 85 dBA, respectively, over a period of 3 hours. The unoccluded noise levels for the shooters and the RSO were in excess of the Canada Labour Code 8-hour limit of 87 dBA, using the 3 dB exchange rate.

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impulse noise, personal weapons test
Report Number
DRDC-TORONTO-SL-2007-112 — Scientific Literature
Date of publication
01 Oct 2007
Number of Pages
Reprinted from
Canadian Acoustic, vol 35, no 3, 2007, p 192-193.
Electronic Document(PDF)

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