Farklı Derinliklerdeki Toprak Örneklerinin Radon Salınım Hızlarının Belirlenmesine Yönelik Ön Çalışma

Abstract

Kütahya, Türkiye’de bir inşaat alanında toprak yüzeyinden itibaren 20 cm aralıklarla beş farklı derinlikten toplanan toprak örneklerinin radon alan salınım hızı ve kütle salınım hızları E-Perm algıçları kullanılarak belirlenmiştir. Toprak örneklerinin radon konsantrasyonu akümülatör yöntemi kullanılarak belirlenmiştir. Toprak örneklerinin radon konsantrasyonu beş günlük analiz süresinde 34 ± 4,4 Bq.m-3 ile 86 ± 6,8 Bq.m-3 aralığında, ortalama 48,6 ± 5,1 Bq.m-3 olarak ölçülmüştür. Toprak örneklerinin radon alan salınım hızları 233,2 ± 24,4 mBq.m-2.h-1 ortalama ile 163,7 ± 21,3 ve 413,1 ± 32,6 mBq.m-2.h-1 aralığında hesaplanmıştır. Toprak örneklerinin radon kütle salınım hızları 32,9 ± 4,3 ve 83 ± 6,6 mBq.kg-1.h-1 aralığında ortalama 46,9 ± 4,9 mBq.kg-1.h-1 olarak bulunmuştur. Kapalı ortama örnekleme yapılan toprak örneklerinden 6,5 Bq.m-3’lük radon katkısı geldiği tahmin edilmektedir.

Keywords

• Radon alan salınım hızı
• raadon kütle salınım hızı
• kapalı ortama radon katkısı tahmini

A Preliminary Study to Determine the Radon Exhalation Rates of Soil Samples at Different Depths

Abstract

The radon area exhalation rate and mass exhalation rate of the soil samples collected from five different depths from soil surface with 20 cm intervals of a construction site at Kütahya, Turkey was determined by using the E-Perm detectors. Accumulator method is used to determine the radon concentration of the soil samples. Radon concentration of the soil samples were measured between 34 ± 4.4 Bq.m-3 to 86 ± 6.8 Bq.m-3 with an average value of 48.6 ± 5.1 Bq.m-3 for five days analysis time. Radon area exhalation rate of the soil samples were calculated between 163.7 ± 21.3 and 413.1 ± 32.6 mBq.m-2.h-1 with an average of 233.2 ± 24.4 mBq.m-2 .h-1. Radon mass exhalation rate of the soil samples were found between 32.9 ± 4.3 to 83 ± 6.6 mBq.kg-1.h-1 with a mean value of 46.9 ± 4.9 mBq.kg-1.h-1. The radon contribution to the indoor air from soil samples is estimated as 6.5 Bq.m-3.

Keywords

• Radon area exhalation rate
• Radon mass exhalation rate
• Indoor radon contribution estimation

References

1. [1] UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation) 2000. Sources and effects of ionizing radiation Report to the General Assembly, with Scientific Annexes, Volume I: Sources, ANNEX-B. United Nations Publications, New York.
2. [2] Alhamdi, W.A., Abdullah, K.M.S. 2021. Determination of radium and radon exhalation rate as a function of soil depth of Duhok Province – Iraq. Journal of Radiation Research and Applied Sciences, 14, 1687-8507. DOI: 10.1080/16878507.2021.1999719.
3. [3] Wilkening, M. 1990. Radon-Soil to Air, Chapter 5. Studies in Environmental Science, 40, 43-58. DOI: 10.1016/S0166-1116(08)70009-8.
4. [4] Kotrappa, P., Stieff, F. 2009. Radon exhalation rates from building materials using electret ion chamber radon monitors in accumulators. Health Physics, 97, 163-166. DOI: 10.1097/HP.0b013e3181a9ab15.
5. [5] Tabar, E., Yakut, H., Kuş, A. 2018. Measurement of the radon exhalation rate and effective radium concentration in soil samples of southern Sakarya, Turkey. Indoor and Built Environment, 27, 278-288. DOI:10.1177/1420326X16672510.
6. [6] Tawfiq, N., Jaleel, J. 2015. Radon Concentration in Soil and Radon Exhalation Rate at Al-Dora Refinery and Surrounding Area in Baghdad. Detection, 3, 37-44. DOI: 10.4236/detection.2015.34006.
7. [7] Huang, D., Liu, Y., Liu, Y., Song, Y., Hong, C., Li, X. 2022. Identification of sources with abnormal radon exhalation rates based on radon concentrations in underground environments. Science of The Total Environment, 807, 150800. DOI:10.1016/j.scitotenv.2021.150800.
8. [8] Li, P., Sun, Q., Geng, J., Yan, X., Tang, L. 2022. Radon exhalation from temperature treated loess. Science of The Total Environment, 832, 154925. DOI: 10.1016/j.scitotenv.2022.154925.

9. [9] Kumar, M., Kumar, P., Prajith, R., Agrawal, A., Sahoo, B. K. 2022. Radon exhalation potential and natural radioactivity in soil collected from the surrounding area of a thermal power plant. Journal of Radioanal Nuclear Chemistry, 331, 2597–2607. DOI: 10.1007/s10967-022- 08298-x
10. [10] Atyotha, V., Thopan, P., Fungdet, S., Somtua, J. 2022. Radon exhalation rates of soil samples from Khon Kaen Province, Thailand. Mindanao Journal of Science and Technology, 20, 223-235.
11. [11] Aldenkamp, F.J., de Meijer, R.J., Put, L.W., Stoop, P. 1992. An assessment of in situ radon exhalation measurements, and the relation between free and bound exhalation rates. Radiation Protection Dosimetry, 45, 449–45. DOI: 10.1093/rpd/45.1-4.449.
12. [12] Samuelsson, C., Pettersson, H. 1984. Exhalation of 222Rn from porous materials. Radiation Protection Dosimetry, 7, 95–100. DOI: 10.1093/oxfordjournals.rpd.a082971.
13. [13] Samuelsson, C. 1990. The Closed-Can Exhalation Method for Measuring Radon. Journal of Research of the National Institute of Standards and Technology, 95, 167-169. DOI:10.6028/jres.095.019
14. [14] Abo-Elmagd, M. 2014. Radon exhalation rates corrected for leakage and back diffusion – Evaluation of radon chambers and radon sources with application to ceramic tile. Journal of Radiation Research and Applied Sciences, 7, 390-398. DOI: 10.1016/j.jrras.2014.07.001.
15. [15] Chao, C.Y., Tung T.C. 1999. Radon emanation of building material--impact of back diffusion and difference between one-dimensional and three-dimensional tests. Health Phys., 76, 675-681. DOI: 10.1097/00004032-199906000-00011.
16. [16] Kuş, A., Yakut, H., Tabar , E., 2016. Radon exhalation rates and effective radium contents of the soil samples in Adapazarı, Turkey. AIP Conference Proceedings, 1722, 030009. DOI: 10.1063/1.4944132.
17. [17] Baykara, O., Doğru, M., İnceöz, M., Aksoy, E. 2005. Measurements of radon emanation from soil samples in triple-junction of North and East Anatolian active faults systems in Turkey. Radiation Measurements, 39, 209-212. DOI: 10.1016/j.radmeas.2004.04.011.
18. [18] Kurnaz, A., Turhan, Ş., Hançerlioğulları, A., Gören, E., Karataşlı, M., Altıkulaç, A., Erer, A.M., Metin, O. 2020. Natural radioactivity, radon emanating power and mass exhalation rate of environmental soil samples from Karabük province, Turkey. Radiochimica Acta, 108, 573-579. DOI: 10.1515/ract-2019-3188.
19. [19] Kotrappa, P. 2000. Review of E-PERM passive integrating electret ionization chambers for measuring radon in air, thoron in air, radon in water and thoron flux from surfaces and mill tailings. International Radon Symposium (2000), 14, 1-12.
20. [20] Kotrappa, P., Jester, W.A., 1993. Electret ion chamber radon monitors measure dissolved 222Rn in water. Health Phys., 64, 397-405. DOI: 10.1097/00004032-199304000-00007.
21. [21] Kotrappa, P., Dempsey, J. C., Ramsey, R. W., Stieff, L. R. 1990. A practical E-PERM (Electret Passive Environmental Radon Monitor) system for indoor 222Rn measurement, Health Physics, 58, 461-467.
22. [22] UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation) 1988. Sources, effects and risks of ionizing radiation. United Nations, New York.
23. [23] Taşer, A. , Uçaryılmaz, S. , Çataroğlu, I., Sofuoğlu, S. C. 2022. Indoor air CO2 concentrations and ventilation rates in two residences in İzmir, Turkey. Environmental Research and Technology , 5 , 172-180.
24. [24] Radyasyon Güvenliği Yönetmeliği, 2000, Resmi Gazete Sayısı: 23999. (https://www.mevzuat.gov.tr/mevzuat?MevzuatNo=5272&MevzuatTur=7&MevzuatTertip=5 ).