The membrane characteristics controlling125I and36Cl transport across anion exchange paper membranes are examined using four different ion exchange capacities paper membranes treated with trim ethylhydroxypropylamino group. Nonequilibrium thermodynamic analyses for the paper membrane transport process are carried out based on transmembrane potential, membrane conductance, and ion flux measurements. The electroconductive membrane, permeabilities representing the solution membrane ion distribution due to electrostatic effects, and the diffusional membrane permeabilities, representing the migration speed of ions within the membrane phase, for125I are higher than those for36Cl in all cases. In the paper membrane treated with trim ethylhydroxypro-pylamino group, 125I diffusion or125I solution/membrane distribution process can be improved by increasing the concentration of anion exchange sites in the paper membrane. These findings indicate the potential utility of paper membranes prepared in this way for separating125I from radioactive waste that has been contaminated with chloride ions. The125I transport performance of such systems may be improved with the use of other anion-exchange groups.
Dose conversion coefficients from neutron fluence to operational quantities have been changed with the revision of radiation protection ordinances in Japan in April 2001. The influences of the revision were examined for the popularly used neutron dosemeters. It was shown, as a result, that the relative energy response to dose equivalent was not so changed by the revision. In addition, various dosemeters were examined on the ratios between the reading and true dose equivalent, when they were used in the various neutron fields. The percentages of the cases whose ratios were within 1-2 were 23-77% and 9-82% in 180 fields, for the representative rem counters and personal dosemeters, respectively, when the dosemeters were calibrated with252Cf source.