charcoal paper
4.The results showedthat the adsorbent which consisted of three layers of high-efficiency glassfibre filter paper,3cm thick inert supporter of the 6201 impregnated with5% CdI_2 and 3cm thick coconut shell charcoal impregnated with 5% TEDAwas capable of differentiating and measuring the radioiodine aerosol,elemental radioiodine and radioactive methyl iodide.

