Passive dosimetry using detector tubes

Abstract

Detector tubes for toluene were cut to produce a nominal 0.5 cm orifice above the indicator material, and exposed to known vapor concentrations. The time needed to reach a pre-determined stain length by simple diffusion was measured. Calibration charts were prepared for time versus concentration for a 1 mm stain, as well as for various stain lengths. Tests were performed to determine the effect of increasing the orifice length and of diffusion through the glass wool plug. Each of these parameters resulted in less reliable concentration measurements than tubes of relatively shorter orifice length having no glass wool plug. Diffusion theory was used to develop theoretical calibration charts for comparison with experimental results, with the former underestimating necessary for appearance of the experimentally observed stains. The use of detector tubes having an orifice length of 0.5 cm as passive dosimeters is shown to be highly feasible based on experimental results.

Sampling for chemical analysis

“…Cadoff and Hodgeson (82) discussed the construction and operational characteristics of passive samplers for exposure to pollutants at ambient atmospheric levels with short-term sampling periods of 1 h or less. Passive dosimeters for solvent vapors using conventional gas detector tubes were described by Hill and Fraser (216). Samimi and Falbo have studied the efficiency of Abcor organic vapor dosimeters under various air velocity conditions and exposure to various concentrations of styrene, ethyl acrylate, and n-butyl acrylate.…”

Smartphone-Based Color Evaluation of Passive Samplers for Gases: A Review

“…Extension of visual detection using color cards/charts as a reference provides instrument-free semi-quantitative measurements. Quite a number of passive samplers (often also termed passive dosimeters, see above) in tube and badge configurations for gas analysis-many of them being commercially available-use this approach (e.g., [47][48][49][50][51][52][53]). For true quantitative detection, spectrophotometric and, more rarely, reflectometric detection is applied either in situ or after (liquid) extraction [9,10,46,52,53].…”