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Translation - English Two. Ultrasound indicator and its maximum permissible limit at a workplace
2.1. The sound pressure level (dB) at one-third octave range with a geometric mean frequency between 12.5-100.0 kHz shall be taken as an indicator of ultrasonic noise produced at the workplace.
2.2. The sound pressure level permissible at the workplace shall not exceed the limits shown in the table below.
2.3. The logarithmic level determined by the formula of Lv=20lgV/V0 or the maximum speed value of the vibration with frequency between 1.105-1.109 shall be taken as an indicator of ultrasound that transmits directly into the human body.
V – Maximum speed value of the vibration, m/c
V0- Average speed value of the vibration (equals 5.106m/c)
The relation between the logarithmic level of the vibration speed (dB) and its values is shown in Annex 1.
2.4. The maximum permissible limit of ultrasound in areas, where the operator uses his hands and other body parts to operate and directly handle the ultrasonic device, shall not exceed 110 dB.
The vibration speed can be calculated upon considering the maximum output power at 0.1w/cm2, based on load conditions.
Other - National University of Mongolia
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