Toprak Gazı Radon Konsantrasyon Seviyesi ile Örnekleme Noktasının Akşehir Fay Hattına Uzaklığı Arasındaki İlişki

Abstract

Radon, kaya tabakasında bulunan uranyumun bozunum zinciri içinde oluşan tatsız, kokusuz, renksiz radyoaktif bir soy gazdır. Radon gaz halinde olduğu için, uranyum ve radyum olan ana radyonüklidlerinden daha hareketlidir. Bu yüzden, radon, toprak granülleri arasındaki gözeneklerden, kayadaki açıklıklar, çatlaklar ve kırıklardan kaçmasıyla toprağı ve kayaları kolayca terk edebilir. Bu özelliklerden dolayı, radon konsantrasyon seviyelerindeki değişiklikler genellikle sismolojik amaçlar için kullanılır. Bu çalışmanın amacı, Akşehir fay hattındaki toprak gazında radon aktivite konsantrasyonuyla örnekleme noktalarının fay hattına olan dik uzaklığı arasındaki ilişkiyi incelemektir. Bu amaçla, radon aktivite konsantrasyonları altı aylık dönemde 10 örnekleme noktasında aylık olarak belirlenmiştir. Tüm örnekleme noktaları için anlamlı bir korelasyon görülmemesine rağmen, yalnızca altı örnekleme noktası dikkate alındığında 0.96'lık bir korelasyon katsayısı elde edilmiştir.

Keywords

• Toprakta radon,Fay hattına uzaklık,Akşehir fay hattı,Afyonkarahisar

The Relationship between Soil Gas Radon Concentration Level and the Distance of Sampling Point to Akşehir Fault Zone

Abstract

Radon is a tasteless, odorless, colorless radioactive noble gas which is produced in the decay chain of uranium existed in the rock layer. Since radon is in the gas form, it is more mobile than its parent radionuclides which namely are uranium and radium. Therefore, radon can easily escape soil and rocks through the pores between the soil granules, and the openings in the rock, cracks, and fractures. Because of these characteristics, changes in radon concentration levels are commonly used for seismological purposes. The aim of this study is to investigate the relationship between the radon activity concentration in soil gas on Akşehir fault zone and the vertical distance of the sampling points to the fault zone. For this purpose, radon activity concentrations were monthly determined at 10 sampling points during six-month period. Although no significant correlation can be seen for all sampling points at all, a correlation coefficient of 0.96 was obtained when only the six of sampling points taken into account.

Keywords

• Radon in soil gas,Distance to fault zone,Akşehir fault zone,Afyonkarahisar

References

1. [1] A.B. Tanner, “Radon migration in the ground: A supplementary review”, Natural Radiation Enviroment III, (T.F. Gesell and W.M. Lowder, eds.), US Department of Energy Report CONF-780422, Washington, DC, 1980, vol. 1, pp. 5-56.
2. [2] J. Sogaard-Hansen and A. Dahkjear, “Determining, “Radon-222 diffusion lengths in soils and sediments,” Health Phys., 53, 455-459, 1987.
3. [3] H. Wakita, “Chemical challenge to earthquake prediction,” Proceedings Natural Academic Science, 93, 3781-3786, 1996.
4. [4] S.D. Schery., D.H. Gaeddert, and M.H. Wilkening, “Transport of radon from fractured rock,” Journal of Geophysical Research: Solid Earth, 87, 2969–2976, 1982.
5. [5] G. Steinitz, U. Vulkan, B. Lang, A. Gilat, and H. Zafrir, “Radon emanation along border faults of the Rift in the Dead Sea area,” Isr. J. Earth Sci, 41, 9-20,1992.
6. [6] G.M. Reimer, “Reconnaissance techniques for determining soil‐gas radon concentrations: An example from Prince Georges County, Maryland,” Geophysical Research Letters, 17, 809–812, 1990.
7. [7] J. Kemski, R. Klingel, H. Schneiders, A. Siehl, and J. Wiegand, “Geological structure and geochemistry controlling radon in soil gas,” Radiat Protection Dosimetry, 45, 235-239, 1992.
8. [8] J. Kemski, “Radonmessungen in der Bodenluft zur Lokalisierung von Störungen im Neuwieder Becken (Mittelrhein),” Bonner geowiss. Schr., 8, 144, 1993.

9. [9] M.M. Moussa and A-G. M. El Arabi, “Soil radon survey for tracing active fault: a case study along Qena-Safaga Road, Eastern Desert, Egypt,” Radiation Measurements, 37, 211-216, 2003.
10. [10] H.S. Akyüz, G. Uçarkuş, D. Şatır, A. Dikbaş, and Ö. Kozacı, “Paleoseismological investigations on surface fracture in the earthquake of 3 February 2002 Çay,” Journal of the Earth Sciences Application and Research Centre of Hacettepe University, 27 (1), 41–52, 2006.
11. [11] A. Koçyiğit, ve Ş. Deveci, “Çukurören- Çobanlar (Afyon) arasındaki deprem kaynaklarının (Aktif fayların) belirlenmesi,” The Scientific and Technological Research Council of Turkey (TÜBİTAK), Project number: 106Y209, 2007.
12. [12] Genitron Instruments, AquaKIT User Manual, Heerstrasse 149 D-60488 Frankfurt, Germany, 2008.
13. [13] Saphymo GmbH, AlphaGUARD User Manual Portable Radon Monitor, Heerstrasse 149 D-60488 Frankfurt, German, 1998.
14. [14] Saphymo GmbH, AlphaPUMP Technical Description, Heerstrasse 149 D–60488 Frankfurt, Germany, 2001.
15. [15] C.Y. King, “Episodic radon changes in subsurface soil gas along active faults and possible relation to earthquakes,” J. Geophys. Res., 85, 3065-3078, 1980.
16. [16] M. Kato, Y. Katsui, Y. Kitagawa, M. Matsui, Regional Geology of Japan. Part 1, Hokkaido, 132–139, 1990.
17. [17] N.R. Varley, and A.G. Flowers, “Radon and its correlation with some geological features of the south-west of England,” Radiation Protection Dosimetry, 45, 245-248, 1992.
18. [18] G.E. Clamp, and J. Pritchard, “Investigation of fault position and sources of radon by measurement of 238U decay series radionuclide activity in soil samples,” Environmental Geochemistry and Health, 20, 39-44, 1998.
19. [19] G. Ciotoli, M. Guerra, S. Lombardi, and E. Vittori, “Soil gas survey for tracing seismogenic faults: A case study in the Fucino Basin, central Italy,” Journal of Geophysical Research: Solid Earth, 103, 23781-23794, 1998.
20. [20] C. Tansia, A. Tallaricob, G. Iovinea, M. Folino Galloa, and G. Falconeb, “Interpretation of radon anomalies in seismotectonic and tectonic gravitational settings: the south–eastern Crati Graben (Northern Calabria, Italy),” Tectonophysics, 396, 181-193, 2005.
21. [21] P. Wang, M.V. de Hoop, R.D. Van der Hilst, P. Ma, and L. Tenorio, “Imaging of structure at and near the core mantle boundary using a generalized radon transform: 1. Construction of image gathers,” Journal of Geophysical Research: Solid Earth, 111, B12, B12304, 2006.
22. [22] X. Wang, Y. Li, J. Du, and X. Zhou, “Correlations between radon in soil gas and the activity of seismogenic faults in the Tangshan area, North China,” Radiation Measurements,60: 8-14, 2014.
23. [23] J. Vaupotic, A. Gregoric, I. Kobal, P. Zvab, K. Kozak, J. Mazur, E. Kochowska, and D. Grzadziel, “Radon concentration in soil gas and radon exhalation rate at the Ravne Fault in NW Slovenia,” Natural Hazards and Earth System Sciences, 10: 895–899, 2010.
24. [24] A. Piersanti, V. Cannelli, and G. Galli, “Long term continuous radon monitoring in a seismically active area,” Ann. Geophys, 58(4), S0437, 2015.
25. [25] Y. Yang, Y. Li, Z. Guan, Z. Chen, L. Zhang, C. J. Lv, and F. Sun, “Correlations between the radon concentrations in soil gas and the activity of the Anninghe and the Zemuhe faults in Sichuan, southwestern of China,” Applied Geochemistry, 89, 23–33, 2018.
26. [26] N. Segovia, M. Mena, P. Pena, E. Tamez, J.L. Seidel, M. Monnin, and C. Valdes, “Soil radon time series: Surveys in seismic and volcanic areas,” Radiation Measurements, 31, 307-312, 1999.
27. [27] V. Walia, S. Mahajan, A. Kumar, S. Singh, B.S. Bajwa, S. Dhar, and T.F. Yang, “Fault delineation study using soil–gas method in the Dharamsala area, NW Himalayas, India,” Radiation Measurements, 43, 337-342, 2008.