Study On The Method To Analyze Concentrations of Rn-222 And Rn-220 In The Air Using Solid State Nuclear Track Detector LR115

Radon is one of the natural radiation contributes the largest percentage to the total average annual effective dose equivalent to human. Although all isotopes of radon are radioactive and also emits alpha radiation, Rn-222 and Rn-220 are the most important of the three radon isotopes because of its concentrations in indoor air and due to the health effects associated with exposures to its radioactive decay products. Actinon (Rn-219) does not contribute significantly to human radiation exposures due both to the low natural abundance of the 235U precursor and the very short (4s) 219-Rn half-life. Solid state nuclear track detector (SSNTD) is one of method analyzed Rn-222 and Rn-220 concentrations by great difference of half-life between them. The advantage of this technique is simple, easy to use, cheap, and it can deploy concurrently large scale survey of radon, etc. (author)