Standards Development

Scope

This document specifies methods for recording the time history of the sound pressure produced either by shooting with calibres of less than 20 mm, or by detonation of explosive charges of less than 50 g TNT equivalent, within the shooting range at locations of interest, regarding the exposure to sound of the shooter, or any other person within the shooting range. The time history of the sound pressure can be the basis for further analyses of this type of sound at the locations of interest.

Purpose

Modern weapons can produce - in case of firing - at close range (short-range; position of the shooter or the coach) acoustic pulses at levels well above 135 dB, which are difficult to assess at present in terms of a simple limiting value for the sound pressure. One approach to overcome this shortcoming is the Auditory Hazard Assessment Algorithm for Humans (AHAAH-model), which uses the time history of the sound pressure in free field conditions, which are usually not fulfilled in close range conditions. Measurements close to the weapon are not specified, at present. Minor modifications may lead to completely different results, which are often not verifiable. That´s why standardization is needed. There exists common agreement in circles of experts that a procedure, adequate to evaluate the noise exposure of the shooter and a trainer in connection with training and supervision, is needed. A specific Part 6 of the International Standard Series ISO 17201 should provide the corresponding basic elements for dealing with that matter. Of particular importance in this context is the definition of adequate descriptors and the specification of limiting conditions for the measurements of pressure, particle velocities and particle displacement at close ranges around the weapon in action.

Such a standard will lead to data for the evaluation of auditory hazards of persons exposed in this context and allow a more reliable protection in the long term.