DOI QR코드

DOI QR Code

MDA Assessment of NaI(Tl), LaBr3(Ce), and CeBr3 Detectors for Freshly Deposited Radionuclides on the Soil

지표면 침적 방사성핵종에 대한 NaI(Tl), LaBr3(Ce) 및 CeBr3 검출기의 MDA 비교 평가

  • Received : 2019.05.02
  • Accepted : 2019.09.09
  • Published : 2019.09.30

Abstract

The detection performances of the NaI(Tl), $LaBr_3$(Ce) and $CeBr_3$ scintillation detectors, which can be used to rapidly evaluate the major artificial radionuclides deposited on the soil surface in a nuclear accident or radiological emergency, were compared. Detection performance was assessed by calculating the minimum detectable activity (MDA). The detection efficiency of each detector for artificial radionuclides was semi-empirically determined using mathematical modelling and point-like sources having certified radioactivity. The background gamma-ray energy spectrum for MDA evaluation was obtained from relatively wide and flat grassland, and the MDA values of each detector for the major artificial radionuclides that could be released in nuclear accidents were calculated. As a result, the relative MDA values of each detector regarding surface deposition distribution at normal environmental radiation level were evaluated as high in the order of the NaI(Tl), $LaBr_3$(Ce), and $CeBr_3$ detectors. These results were compared based on each detector's intrinsic and measurement environment background, detection efficiency, and energy resolution for the gamma-ray energy region of the radionuclide of interest.

References

  1. G.F. Knoll, Radiation detection and measurement, John Wiley & Sons (2010)
  2. L. Arnold, M. Duval, C. Falgueres, J.J. Bahain, and M. Demuro, "Portable gamma spectrometry with cerium-doped lanthanum bromide scintillators: Suitability assessments for luminescence and electron spin resonance dating applications", Radiat. Meas., 47, 6-18 (2012) https://doi.org/10.1016/j.radmeas.2011.09.001
  3. F. Quarati, P. Dorenbos, J. van Der Biezen, A. Owens, M. Selle, L. Parthier, and P. Schotanus, "Scintillation and detection characteristics of high-sensitivity $CeBr_3$ gamma-ray spectrometers", Nucl. Instrum. Meth. A., 729, 596-604 (2013) https://doi.org/10.1016/j.nima.2013.08.005
  4. A. Camp, A. Vargas, and J.M. Fernandez-Varea, "Determination of $LaBr_3(Ce)$ internal background using a HPGe detector and Monte Carlo simulations", Appl. Radiat. Isotopes., 109, 512-517 (2016) https://doi.org/10.1016/j.apradiso.2015.11.093
  5. J.H. Lee and J.I. Byun, "IN-SITU GAMMA-RAY SPECTROMETRY FOR RADIOACTIVITY ANALYSIS OF SOIL USING NaI(Tl) AND $LaBr_3(Ce)$ DETECTORS", Appl. Radiat. Isotopes (2019). In press.
  6. J.H. Lee, J.I. Byun, and D.M. Lee, "In-situ $CeBr_3$ gamma-ray spectrometry for radioactivity analysis of soil", J. Radioanal. Nucl. Chem., (2019). In press.
  7. ICRU 53 Gamma-Ray Spectrometry in the Environment. International Commission on Radiation Units and Measurements. Bethesda, Maryland. Report 53 (1994).
  8. K.M. Miller and P. Shebell, "In situ gamma-ray spectrometry: a tutorial for environmental radiation scientists", USDOE Environmental Measurements Lab. (1993)
  9. IAEA-TECDOC, B., "1092", Generic procedures for monitoring in a nuclear or radiological emergency. International Atomic Energy Agency. Vienna (1999).
  10. L.A. Currie, "Limits for qualitative detection and quantitative determination. Application to radiochemistry", Anal. Chem., 40(3), 586-593 (1968). https://doi.org/10.1021/ac60259a007
  11. E. Garcia-Torano, B. Caro, V. Peyres, and M. Mejuto, "Characterization of a $CeBr_3$ detector and application to the measurement of some materials from steelworks", Nucl. Instrum. Meth. A., 837, 63-68 (2016) https://doi.org/10.1016/j.nima.2016.09.006