Description

The using of special protective clothes for dangerous environment expects the determination of limits their safety and reliability. One of possibility of evaluation of barrier properties these protective clothes are testing during acting model gas. Present method of evaluation is based on system local passive dosimeters. This method described above is very complicated and work-intensive (evaluation of the dosimeters by gas chromatography). Also, this method does not make possible accurate localization of the penetration place trough barrier textile. Therefore, was developed method at the National Authority for Nuclear, Biological and Chemical Protection Czech Republic, which makes possible the indication of penetration by the concrete place thanks the colour change of special underwear textile after reaction with acceptable indicator. This colour change allows quantitative evaluation of quantity of penetrated gas. Quantity is same as intensity of colour change as well as area of place where is colour change located. Penetrating gas has the most intensive reaction in area concrete penetration. Thanks, the diffusion and flow is his trace step by step feathered so that there are the new areas with progressive growing down of colour change intensity. The areas with growing down of colour change intensity are bigger than areas indicating concrete area of penetration. In past time the method of evaluation was based on the visual comparison colour changes by etalons done with the same material as underwear textile, which was exposed different gas dose (Dose is product c x t, that mean the influence of gas with concentration c during the time t on the etalon). This evaluation is relatively successful for approximate estimation of total penetration, but thanks the considerable incorrectness and subjectivity is non-acceptable for comparative determination and required correlations for extra dangerous substances. From these reasons was sought system of objective evaluation, which would safe advantages of single valued, prompt and area identification by the mean of colour change.

Product Details

Published:

10/23/2017

Number of Pages:

9

File Size:

1 file , 830 KB