Firouz Valipour, Habibollah Dehghan, Gholamhossien Pourtaghi, Mehdi Jahangiri, Mahnaz Mazahabi,
Volume 6, Issue 3 (3-2011)
Abstract
Background: Noise is one of the harmful factors of industrial environments that may cause defect such as hearing defects, high blood pressure, irritation, sleep disturbances, increased respiratory rate and oxygen consumption. The residents and personnel working in industries around Mehrabad airport continuously exposed to noise pollution caused by the traffic of passenger, war and training airplanes. The aim of this research was to evaluate the noise exposure in personnel of various industrial and administrative units of the Aerospace university research complex next to Mehrabad airport. Methods: In this research due to variations in air transportation system and changing the number of flights during the day eight-hour personal dosimetry in a one-week period and octa and band analysis in wind tunnel room was performed. Sound level meter (CEL-440) and dosimeters (CEL 281 & 282) were used as measurement equipment. Obtained data was compared with the standards of Iranian Occupational Health Technical Committee and American Conference of Governmental Industrial Hygienists (ACGIH-2005). Findings: Values obtained from noise dosimetry were as follows; build hall 96.7(dB), welding 99.6(dB), aerodynamic 94 (dB), modeling 99.6(dB), shielding 95(dB), administrative building 77 (dB), planning office 77 (dB) and security station 76 dB. The result of octave-band analysis on the frequencies of 125, 250, 500, 1000, 2000, 4000 and 8000(Hz) were 93.1, 95.5, 93.1, 90.2, 85.5, 77.6 and 68.46(dB) respectively. Conclusion: The results of this study indicated that noise rate was above the standard rate (ACGIH-2005) and that was recommended by the country's occupational health technical committee, so, in order to prevent the consequences of noise exposure recommendations were presented Key word: Noise pollution, Noise measurement, Noise dosimetry, Mehrabad Airport
Hossein Kardan Yamchi, Firouz Valipour, Gholamhossein Pourtaghi, Habibollah Dehghan, Mohammad Salem, Zohreh Jamali,
Volume 11, Issue 3 (10-2015)
Abstract
Background: One of the important consequences of the industrial revolution is the increasing of the intensity level of workplace noise. Aim of this paper was to explain the role and importance of the noise level in the dental workplace, to has been evaluate of dentistry noise exposure, dental unit hand piece noise level and the different part equipment of the great centers of dentistry, Tehran.Methods: In this cross - sectional study, Sound pressure level(SPL) were measured using B&K noisemeter models 2237 in the hearing zone of dentists at restoration parts, diagnostics, pediatrics, periodontics, oral surgery, endodontics and the CSR departments. The average sound pressure level means were measurement using the ISO 3744 standard.Findings: The results show that the highest levels of sound pressure level (dB) among all studied departments were pediatric Ángel hand piece that was obtained 86 dB. Comparison of sound pressure level (LPT) showed the Maximum amount belonging to ultrasonic devices that was obtained 96.8dB.Conclusion: The results of this study showed that the average noise level is high and as an important risk factor for hearing loss in exposed personals. In order to avoid problems caused by noise, such as hearing loss and use of suitable PPE is required accurate performance of hearing conservation program. Key Words: Noise, Ddental Center, Unit, Sound Pressure Level, Hand Piece
