Part 2 – Requirements for non ventilated protective clothing against particulate radioactive contamination.
The test method used is the total inward leakage method defined in EN ISO 13982-2 Method B.
The test follows essentially the same protocols as the Type 5 test.
This test involves exposing a whole suit (6 or more test suits) to a dry aerosol of sodium chloride. The particle size is 0.6 μm. While being exposed to the dry aerosol, the wearer of the suit performs the following sequence of movements: standing, walking, squatting. The total inward leakage is expressed as a percentage of the concentration of sodium chloride outside the suit measured for each test suit at 3 points – knee, waist and chest. Therefor for each suit 9 measurements are taken and the 54 results averaged and consolidated as follows -
The average readings are then used to determine the following -
Total Inward Leakage % - TILA %- average results all 6 wearers, all activities and all positions.
Total Inward Leakage % -TILE % - average inward leakage results all 6 wearers, all positions for one activity of standing, walking or squatting.
The highest mean value of Total Inward Leakage for one activity – highest TILE % and the TILA % are then used to determine the Nominal Protection Factor as defined in the table below.
Non-ventilated protective clothing shall be classified according to BS EN 1073-2:2002.
|Class||Mean value of the inward leakage of the three sampling positions inside the suit while standing, walking or squatting - 6 suits: 9 measurements recorded per suit.||Nominal Protection Factor|
|One Activity TILE %||All Activities TILA %|
|3||< 0.3||< 0.2||500|
|2||< 3.0||< 2.0||50|
|1||< 30.0||< 20.0||5|