Design and construct optimum dosimeter to detect airborne radon and thoron gas: Experimental study

作者：Ismail Asaad H^*; Jaafar Mohamad S

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2011, 269(4): 437-439.

DOI：10.1016/j.nimb.2010.12.057

• CR-39NTDs
• Airborne radon/thoron
• Dosimeters
• Calibration factor

Aim of this work is to design and select optimum dimension of a radon and thoron dosimeter within the measure optimum value of the calibration factor, using CR-39 Nuclear Track Detectors (NTDs). The results show that the best dimension to detect and measure real values of airborne radon and thoron concentrations is 6 cm and 7 cm for diameter and height, respectively. Calibration factors (K) for radon and thoron at this dimension were 2.68 +/- 0.03 cm and 0.83 +/- 0.01 cm, respectively, and these factors relatively depend on the detector efficiency. Therefore, the efficiency of CR-39NTDs to register alpha particles and their effects on the calibration factor estimated. It is found that the calibration factor increased exponentially with detector efficiency. Moreover, detector efficiency was equal to 80.3 +/- 1.23% at the optimum dosimeter.

• 出版日期2011-2-15