ON THE ISSUE OF SAFETY OF SHORT-TERM EXPOSURE TO HIGH-INTENSITY NOISE OF A CHANGING KEY

Relevance. The introduction of special sound installations into security systems necessitates a medical and biological assessment of the impact of sound signals.

Intention. The purpose is to evaluate the safety of a special sound signal (high-intensity mid-frequency noise changing with a frequency of 7 Hz tonality).

Methods. In the laboratory, experiments were conducted with the participation of volunteers at sound levels of 94, 110 dBA and 20 minutes exposure (including personal protection equipment (PPE) for the hearing organ).

Results and discussion. The impact on a human of a special sound signal with a sound level of 94 dBA for 20 minutes does not have a significant effect on the condition of the hearing organ and does not cause a deterioration in overall well-being. A sound level of 110 dBA is established to be subjectively tolerable. However, after this exposure for 20 minutes, the overall wellbeing of volunteers worsened, accompanied by a subsequent sleep disturbance, which persisted a day after the exposure. The increase in the thresholds of sound perception at frequencies of 3000, 4000 and 6000 Hz reached 50–55 dB with a delay of their recovery up to 5 days. It was established autoexperimentally that the sound level of 126 dBA is voluntarily intolerable and forces a person to leave the affected area or to close his ears with his hands. Effective means of individual hearing protection preclude deterioration of overall health when exposed to a sound level of 110 dBA for at least 40 minutes.

Сonclusion. Based on the results of the research, the safe time of exposure to the special sound signal of up to 120 dBA is established, as well as characteristics of individual hearing protection devices providing an effective level of protection.

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