Estimation of Radiological Dose From Progeny of 222Rn and 220Rn Using DTPS/DRPS and Wire-Mesh-Capped Progeny Sensors

摘要

Radon (²²²Rn) and its decay products are the major sources of natural radiation exposure to general population. The activity concentrations of unattached and attached short-lived ²²²Rn and thoron (²²⁰Rn) progeny in indoor environment of some dwellings of the Jalandhar and Kapurthala districts of Punjab had been calculated using the deposition-based progeny sensors (DRPS/DTPS) and wire-mesh-capped (DRPS/DTPS) progeny sensors. The observed concentration of attached ²²²Rn and ²²⁰Rn progeny showed the variation from 5 to 21 Bq·m⁻³ and 0.3 to 1.7 Bq·m⁻³, respectively. The activity concentration of the unattached ²²²Rn and ²²⁰Rn progeny varies from 1 to 5 Bq·m⁻³ and 0.1 to 0.6 Bq·m⁻³, respectively. The average unattached fraction of ²²²Rn and ²²⁰Rn progeny is 0.2 and 0.1. The average value of the indoor aerosol concentration attachment rate of ²²²Rn and ²²⁰Rn progeny is 2251 cm⁻³, 24 ms⁻¹, and 617 ms⁻¹. Relation among the unattached fraction and attachment rate is established, and the obtained results of dose conversion factors show the significance of the nano-sized ²²²Rn decay products in ²²²Rn dosimetry.