Paik N W, Walcott R J, Brogan P A
Am Ind Hyg Assoc J. 1983 Jun;44(6):428-32. doi: 10.1080/15298668391405085.
Contents and types of asbestos in fireproofing insulation materials sprayed on ceilings of 127 buildings throughout the U.S. were studied. Asbestos was found to be present in more than 50% of the buildings and chrysotile was the main component identified. Frequency distribution of airborne fiber concentrations was lognormal. During renovation activities by various workers, including sheet-metal workers, carpenters and electricians, average fiber concentrations at workers' breathing zones were less than 2 fibers/cc, but exceeded 0.1 fibers/cc. During removal of sprayed materials, workers were exposed to extremely high concentrations (average 16.4 fibers/cc) when dry methods were used. When wet methods were used during removal, the airborne fiber concentrations were sharply reduced to less than 2 fibers/cc.
对美国127栋建筑物天花板上喷涂的防火绝缘材料中的石棉含量和类型进行了研究。发现超过50%的建筑物中存在石棉，且已识别出的主要成分是温石棉。空气中纤维浓度的频率分布呈对数正态分布。在包括钣金工、木匠和电工在内的各类工人进行翻新活动期间，工人呼吸区域的平均纤维浓度低于2根/立方厘米，但超过了0.1根/立方厘米。在拆除喷涂材料时，采用干法作业的工人会暴露于极高浓度（平均16.4根/立方厘米）的环境中。在拆除过程中采用湿法作业时，空气中的纤维浓度会急剧降至低于2根/立方厘米。
