Gamma Spectrometric Efficiency Measurement Uncertainty of 137Cs in the Vegetation Sample

Abstract

In this study, gamma spectrometric efficiency measurement uncertainty of ¹³⁷Cs in vegetation sample is investigated. Each uncertainty component is evaluated and quantified. For this purpose, n-type 70% efficiency HPGe detector was used. The combined standard uncertainty of ¹³⁷Cs efficiency was found to be 2.43%.

Keywords

• Efficiency Uncertainty,Gamma Spectrometry,Cs-137,vegatation

References

1. 1. Nucléide – Lara Library for gamma and alpha emissions. http://www.nucleide.org/Laraweb (accessed at 21.03.2018).
2. 2. Di Gregorio, DE, Huck, H, Aristegui, R, De Lazzari, G, Jech A. 2004. 137Cs contamination in tea and yerba mate in South America. Journal of the Environmental Radioactivity; 76:273–281
3. 3. Kuwahara, C, Fukumoto, A, Ohsone, A, Furuya, N, Shibata, H, Sugiyama, H, Kato, F. 2005. Accumulation of radiocesium in wild mushrooms collected from a Japanese forest and cesium uptake by microorganisms isolated from the mushroom-growing soils. Science of the Total Environment; 345:165– 173.
4. 4. Lehto, J, Vaaramaa, K, Leskinen A. 2013. 137Cs, 239,240Pu and 241Am in boreal forest soil and their transfer into wild mushrooms and berries. Journal of Environmental Radioactivity; 116:124-132.
5. 5. Marzano, FN, Bracchi, PG, Pizzetti P. 2001. Radioactive and Conventional Pollutants Accumulated by Edible Mushrooms (Boletus sp.) Are Useful Indicators of Species Origin. Environmental Research Section A.; 85: 260-264
6. 6. Topcuoglu, S, Güngür, N, Köse, A, Varinlioglu A. 1997. Translocation and depurtion of 137Cs in tea plants. Journal of Radioanaltical and Nuclear Chemistry; 218: 2: 263-266.
7. 7. Gordon, RG. Practical Gamma-ray Spectrometry; Wiley, 2nd ed.: Sussex, England, 2008; pp 150.
8. 8. Lepy, MC, Pearce, A, Sima, O. 2015. Uncertainties in gamma-ray spectrometry. Metrologia; 52: S123-S145.

9. 9. IAEA- International Atomic Energy Agency. Guide Quantifying Uncertainty in Nuclear Analytical Measurements. IAEA-TECDOC-1401, Vienna, 2004
10. 10. ISO. Guide to the Expression of Uncertainty in Measurement, 1995.
11. 11. EURACHEM / CITAC GUIDE CG4. Quantifying Uncertainty in Analytical Measurement. 3nd Edition. 2012.P1.
12. 12. XCOM, NIST, Pyhsical Meas. Laboratory. https://physics.nist. gov/PhysRefData/Xcom/html/xcom1.html (accessed at 21.03. 2018).