Orateur
Description
Polycarbonate track detector (PCTD) have found wide applications in particular when used in radon monitoring cups [1-3]. In order to overcome some deficiencies such as long-term exposures required, recently Tommasino and coworkers [4] introduced a novel Activated Carbon Fabric (ACF)/CR-39 detector in which the ACF adsorbs radon on its active sites and exposes the CR-39; when CR-39 is chemically etched leads to an ACF/CR-39 response significantly enhanced[4]. Using the ACF combined with PCTD, Sohrabi and Ebrahiminezhad have recently introduced electrochemically-etched (ECE) PCTD/ACF multi-function radon individual and environmental monitors[5-7]. A comparative PCTD/ACF and PCTD/bare method was applied which also introduced an amplification factor (AF) which can be correlated to radon/progeny equilibrium factor, yet to be further studied and calibrated. The PCTD/ACF registers alpha particles from radon adsorbed on its carbon active sites at a higher rate than that of PCTD/bare which registers alphas from radon and progeny. The ratio of PCTD/ACF tracks to that of PCTD/bare leads to a track density ratio or amplification factor (AF) ≥ 1[5-7]. In this line of development, the methods have been successfully studied for individual and environmental radon monitoring in air as well as radon and radium-226 monitoring in water. In particular, a novel mega-size radon monitoring method using a mega-size radon PCTD detector (33 x 75 cm2) [8], processed in a mega-size single-cell ECE image processing system[9], for large area radon monitoring. Another novel development is Long Strip Polycarbonate Radon Monitor with or without ACF methodology processed in a novel Long ECE Image Processing Chamber developed in this research for continuous monitoring of radon; e.g. over a long wall. In this paper, the highlights of such developments are presented and discussed.
References :
[1]. Urban, M., Piesch, E., Low level environmental radon dosimetry with a passive track etch detector device. Radiat. Protect. Dosim. 1 (2), 97–109 (1981).
[2]. Sohrabi, M., Solaymanian, A.R., Indoor radon level measurements in some regions of Iran. Nucl. Tracks Radiat. Meas. 15 (1 4), 613–616 (1988).
[3]. Sohrabi, M., Babapouran, M., New public dose assessment from internal and external exposures in low-and elevated-level natural radiation areas of Ramsar, Iran. In: International Congress Series, vol. 1276, 169–174 (2005).
[4]. Tommasino, L., Tommasino, M. C., Viola, P., Radon-film-badges by solid radiators to complement track detector-based radon monitors. Radiat. Meas. 44 (9-10), 719-723 (2009).
[5]. Sohrabi, M., Ebrahiminezhad, F., Concentration and duration dependence of a new prototype polycarbonate/activated-carbon fabric individual and environmental radon monitor. J. Instrum. 13 (11), P11012 (2018).
[6]. Sohrabi, M., Ebrahiminezhad, F., Effects of activated-carbon-fabric parameters on response of a new polycarbonate-based individual and environmental radon monitor. Radiat. Protect. Dosim. ncz098 (2019). https://doi.org/10.1093/rpd/ncz098.
[7]. Sohrabi, M., Ebrahiminezhad, F., Novel multi-function polycarbonate/activated-carbon-fabric individual/environmental radon twin badges, Radiat. Meas. 134:106332 (2020).
[8]. Sohrabi, M., Ghahremani M., Novel Panorama Megasize Environmental Radon Monitor, Radiat. Phys. Chem. 181, 109325 (2021).
[9]. Sohrabi, M., Novel single-cell mega-size chambers for electrochemical etching of panorama position-sensitive polycarbonate ion image detectors, Rev. Sci. Instrum. 88, 113305 (2017).
