Prior characterization of beryllium contamination is not sufficient to predict the generation of airborne beryllium contamination when the work involved may uncover or disturb hidden contamination. Therefore respiratory protection must be used if there is any question.
Beryllium is a toxic metal.
High level, acute exposures result in a pneumonitis, which can be fatal. The migration of fine particles of beryllium, those that pose a hazard if inhaled, is not readily detectable due to lack of technology for real time detection and measurement. Considering these factors, conservative controls need to be implemented to prevent contamination spread and subsequent potential for worker exposures in areas with beryllium contamination. This is especially the case when machinery, cabinets and other items that have been stationary for many years are removed and reveal beryllium contamination under or behind these objects. Possible additional surface sampling and thorough planning and envisioning of the planned work and its ability to reveal and raise settled particulate matter is recommended if the room configuration is to be changed.