Evaluation of small, color-changing carbon monoxide dosimeters.
Ray-RM; Carroll-HB Jr.; Armstrong-FE
NTIS: PB 243 685 :21 pages
The Bureau of Mines evaluated five commercial badge-type carbon monoxide dosimeters. Color changes in the badge reagent indicated the presence of carbon monoxide. Possible effects of ambient conditions on dosimeter response to carbon monoxide during or after coal mine fires or explosions were studied. Temperature and humidity changes did not change dosimeter sensitivity to carbon monoxide. Contaminant gases such as co2, NO2, so2, and h2s had effects that varied with brands of dosimeters ranging from no effect to increased sensitivity to carbon monoxide. Dosimeters tested after 6 months of storage showed an increase in failure rate as high as 25 percent. Tests were conducted to determine the effects on dosimeter time-for-color change caused by observer's sight (colorblind), lighting, and coal dust on dosimeters. No significant effects were observed. Observer variance was the most pronounced factor observed in all tests.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 243 685