| Autor: |
Philippa L. Vassileva, S. Georgiev, I. Dimitrova, Dobromir S. Pressyanov, T. Boshkova |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD). |
| DOI: |
10.1109/nssmic.2016.8069716 |
| Popis: |
The CDs/DVDs stored indoors could serve as retrospective 222Rn (radon) and 220Rn (thoron) detectors. In the method the disks are used as track-etch detectors of alpha-particles. The signal used for radon measurement is formed by 222Rn which diffuses inside the disk volume. The signal used for thoron measurements is estimated after a correction for the contribution of radon is made. This correction and the radon-related signal both depend on the diffusion length of 222Rn in the disk material (LD). The work studies the influence of LD on the results of 222Rn and 220Rn measurement by CDs/DVDs. For this purpose, LD is determined for used disks naturally exposed to radon in the dwellings from which they were collected. This is done a posteriori using the alpha-tracks accumulated in the disks. The observed values range from 45.4 ± 2.0 μm to 74.3 ± 1.8 μm with an average of 54.2 ± 5.4 μm. Examples of the analysis of 62 disks collected from dwellings demonstrate the influence of LD on the results for thoron. In some cases using an average L D (instead of the actual) can lead to false detection or oversight of thoron. It is recommended that for such disks the diffusion length of radon during the exposure is estimated a posteriori. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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