A new approach for discriminative measurements of different components of external ionizing radiation.

For discriminative measurements of the different components of external ionizing radiation by passive dosimeters, a new monitoring post consisting of a 3-layer lead chamber and 4 sets of passive dosimeters was designed in this study. Based on the theoretical studies, the thicknesses of the lead layers were determined and the algorithm for quantifying the different components of external ionizing radiation was derived. To testify the design, in-situ measurements were carried out at two different sites throughout a year. The results indicated that the monitoring post could accurately measure the hard and soft components of secondary cosmic rays and the terrestrial gamma radiation. Furthermore, it was also confirmed that by adding a passive radon monitor in the monitoring site, the artificial gamma radiation around the monitoring site could also be quantified by the monitoring post.