Investigations on the adsorption of iodine on various pipe materials

In monitoring the exhaust air from nuclear power stations it is not always possible to avoid long pipework lines between the stack and the measuring station. It cannot, therefore, be excluded that radioactive constituents of the exhaust air may become adsorbed on the wall of the piping and thus escape measurement. This paper reports on the adsorption affinity of various pipework materials for iodine. The findings show that teflon and polyethylene are more favourable in this respect than steel and PVC. Adsorption can be reduced still further by electric shielding of the plastic pipes to prevent electrostatic charging. (orig.)