GRAB SAMPLING AND CONTINUOUS MONITORING TECHNIQUES FOR RADON MEASUREMENTS AT CONTROLLED ENVIRONMENTAL CONDITIONS | ||
| Nuclear Sciences Scientific Journal | ||
| Article 13, Volume 5, Issue 1, 2016, Pages 197-208 PDF (881.73 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/nssj.2016.30833 | ||
| Authors | ||
| SAYED F. HASSAN1; MOUSTAFA N. TAWFIK1; MAHMOUD H. SHALABY1; MOHAMED I. HUSSIEN2; IBRAHIM H. IBRAHIM3 | ||
| 1Nuclear Materials Authority,Cairo, Egypt | ||
| 2National Centre for Nuclear Safety, Atomic Energy Authority, Cairo, Egypt | ||
| 3Physics Dept., Fac. Sci., Ain shams univ., Cairo, Egypt | ||
| Abstract | ||
| The continuous monitoring of radon gas concentration is a useful method for studying the effects of ventilation on radon concentration levels. The determination of average radon concentration is more preferable than the active-type. For this purpose, a model chamber of cubic shape made of plexy-glass Radon calibration chamber is a good tool for testing radon measurements for different devices and techniques, a 0.65m3 plexy-glass chamber was constructed to compare between different detecting devices with the change of environmental conditions (temperature–relative humidity–samples concentration) as well as the use of devices inside or outside the chamber. This chamber resembles to a great extend the mines atmosphere which helps in using it as a pilot plant. For this purpose, two devices (RDA-200 and TRI-MET 372) are used for active-type. (RGM l/l and CRM-1027) devices are used for continuous monitoring. The experiments are carried out at two different environmental conditions, one by using high temperature (40oC) and relative humidity (100%), the other by using low temperature (16oC) and low relative humidity (50%). The obtained results show that, lower stability in the measurements with the change in environmental conditions. More stability for the RDA - 200 and Tri-Met devices at high temperature and high humidity was observed. From the other hand, a more stability for both RGM and CRM devices is clearly appeared at low temperature and low humidity conditions. This may be attributed to that the measurements depend mainly on an electronic circuit which has a higher performance at these environmental conditions. | ||
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