Patent ID: 8333124

Claim:
A kit of parts for assembling a diffusive dosimeter for the detection of pollutants, said kit of parts comprising: a housing, a first adsorbent to be removably placed inside said housing, a first spacer to be removably placed on top of said adsorbent, to define a thickness and a first surface area of a diffusive layer, a first protective layer to be removably placed on top of said spacer, a first cover having an opening, to be removably placed on top of said protective layer, to close off the assembled dosimeter at the dosimeter's circumference, at least one additional spacer, each additional spacer being configured to replace said first spacer and defining the same thickness as the first spacer, wherein the first spacer and each additional spacer comprises one or more through-holes, the through-holes being different between the spacers so that each spacer defines a different surface area of the diffusive layer and provides for making a measurement with a different uptake rate, wherein the through-holes have a constant cross-section throughout the thickness; wherein at least one of said additional spacers comprises two through-holes of about equal size, wherein each of the two through-holes of about equal size extends substantially over about one-half of the spacer's surface.