| Autor: |
Murphy, William J., Flamme, Gregory A., Campbell, Adam R., Zechmann, Edward L., Tasko, Stephen M., Lankford, James E., Meinke, Deanna K., Finan, Donald S., Stewart, Michael |
| Předmět: |
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| Zdroj: |
International Journal of Audiology; Feb2018 Supplement, Vol. 57, pS28-S41, 14p, 4 Charts, 8 Graphs |
| Abstrakt: |
Objective:This research assessed the reduction of peak levels, equivalent energy and sound power of firearm suppressors.Design:The first study evaluated the effect of three suppressors at four microphone positions around four firearms. The second study assessed the suppressor-related reduction of sound power with a 3 m hemispherical microphone array for two firearms.Results:The suppressors reduced exposures at the ear between 17 and 24 dB peak sound pressure level and reduced the 8 h equivalent A-weighted energy between 9 and 21 dB depending upon the firearm and ammunition. Noise reductions observed for the instructor’s position about a metre behind the shooter were between 20 and 28 dB peak sound pressure level and between 11 and 26 dBLAeq,8h. Firearm suppressors reduced the measured sound power levels between 2 and 23 dB. Sound power reductions were greater for the low-velocity ammunition than for the same firearms fired with high-velocity ammunition due to the effect of N-waves produced by a supersonic bullet.Conclusions:Firearm suppressors may reduce noise exposure, and the cumulative exposures of suppressed firearms can still present a significant hearing risk. Therefore, firearm users should always wear hearing protection whenever target shooting or hunting. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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