Aerosols photo-ionization

The contractor at Site H had established area and personnel sampling consistent with HAZWOPER requirements. A photo ionization detector (PID) and a real-time aerosol monitor (RAM) were used on a daily basis to screen for potentially hazardous levels of contaminants. On a weekly basis, personal air samples were collected and submitted for laboratory analysis. PPE requirements, however, were often not based on this data because the oversight agency had established inflexible minimum PPE requirements. The audit team found many of the PPE requirements on Site H to be excessive in light of site monitoring data and hazard determinations. 

Discharges in aerosols play an important role in plasma-chemical applications. Photoelectron emission often makes an important contribution in the ionization of aerosols, especially if a radiation quantum exceeds the work function of macro-particles but is below the ionization potential of neutral gas species. In this case, the steady-state electron density is determined by photo-ionization of aerosols and electron attachment to the macro-particles. 

To calculate the steady-state electron density provided by monochromatic E = hw) photo-ionization of spherical macro-particles of radius and concentration (Karachev-tsev Fridman, 1974, 1975), we should first take into account that the woit function of aerosols depends on their charge ... 

Photo-Ionization of Aerosols Continuous-Spectrum Radiation... 

Figure 2-19. Calculation chart for electron number density ( e. cm provided by photo-ionization (flux p, cm s ) of aerosols (number density a, cm ).

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