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Title: Effects of atmospheric parameters on radon measurements using alpha-track detectors

The calibration factors of alpha-track radon detectors (ATDs) are essential for accurate determination of indoor radon concentrations. In this paper, the effects of atmospheric parameters on the calibration factors were theoretically studied and partially testified. Based on the atmospheric thermodynamics theory and detection characteristics of the allyl diglycol carbonate (CR-39), the calibration factors for 5 types of ATDs were calculated through Monte Carlo simulations under different atmospheric conditions. Simulation results showed that the calibration factor increased by up to 31% for the ATDs with a decrease of air pressure by 35.5 kPa (equivalent to an altitude increase of 3500 m), and it also increased by up to 12% with a temperature increase from 5 °C to 35 °C, but it was hardly affected by the relative humidity unless the water-vapor condensation occurs inside the detectors. Furthermore, it was also found that the effects on calibration factors also depended on the dimensions of ATDs. It indicated that variations of the calibration factor with air pressure and temperature should be considered for an accurate radon measurement with a large dimensional ATD, and water-vapor condensation inside the detector should be avoided in field measurements.
Authors:
; ; ; ;  [1]
  1. Institute of Radiation Medicine, Fudan University, 2094 Xietu Road, Shanghai 200032 (China)
Publication Date:
OSTI Identifier:
22253489
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; CALIBRATION; CARBONATES; COMPUTERIZED SIMULATION; CONCENTRATION RATIO; ECOLOGICAL CONCENTRATION; HUMIDITY; MONTE CARLO METHOD; PARTICLE TRACKS; RADIATION MONITORING; RADIATION MONITORS; RADON; THERMODYNAMICS; WATER VAPOR