Advanced Spectral-Ratio Radon Background Estimate in Airborne Gamma-Ray Spectrometry and Calibration Technology

Yi Gu; Heng Lu; Meng Wang; Liangquan Ge; Qingxian Zhang

doi:10.3938/jkps.76.392

Advanced Spectral-Ratio Radon Background Estimate in Airborne Gamma-Ray Spectrometry and Calibration Technology

Journal of the Korean Physical Society ◽

10.3938/jkps.76.392 ◽

2020 ◽

Vol 76 (5) ◽

pp. 392-400

Author(s):

Yi Gu ◽

Heng Lu ◽

Meng Wang ◽

Liangquan Ge ◽

Qingxian Zhang

Keyword(s):

Gamma Ray ◽

Spectral Ratio ◽

Gamma Ray Spectrometry

Download Full-text

Multichannel models for the estimation of radon background in airborne gamma‐ray spectrometry

Geophysics ◽

10.1190/1.1444492 ◽

1998 ◽

Vol 63 (6) ◽

pp. 1986-1996 ◽

Cited By ~ 11

Author(s):

Brian R. S. Minty

Keyword(s):

Gamma Ray ◽

Weighted Least Squares ◽

Spectral Ratio ◽

Ratio Method ◽

Gamma Ray Spectrometry ◽

Minimization Method ◽

Full Spectrum ◽

Spectrometric Data ◽

Spectral Ratio Method ◽

Atmospheric Radon

Adequate background correction is a crucial step in processing airborne gamma‐ray spectrometric data because any errors are amplified during subsequent processing procedures. Two multichannel models for the estimation of atmospheric radon background are proposed. The spectral‐ratio method uses the relative heights of uranium (U) series photopeaks to estimate the contribution of atmospheric radon to observed spectra. The full‐spectrum method estimates the atmospheric radon contribution through the weighted least‐squares fitting of potassium (K), U, thorium (Th), and radon component spectra to the observed spectra. Both the spectral‐ratio and full‐spectrum methods are adequately calibrated through the estimation of component spectra from calibration experiments on the ground using radioactive calibration sources and wood to simulate the attenuation of gamma rays by air. The simulated heights used in these calibrations must be mapped onto real heights through calibration flights over an airborne calibration range. The spectral‐ratio method is also adequately calibrated using a heuristic calibration procedure. An iterative minimization method is used to find the optimum values of the calibration constants such that the radon background over suitable calibration lines is best removed.

Download Full-text

Gamma-Ray Spectrometric Analysis of Some Trace Elements in the Human Articular Disc of the Mandible

Nuklearmedizin ◽

10.1055/s-0037-1621214 ◽

1963 ◽

Vol 03 (02) ◽

pp. 175-182 ◽

Cited By ~ 1

Author(s):

Bo Bergman ◽

Rune Söremark

Keyword(s):

Trace Elements ◽

Neutron Activation ◽

Quantitative Data ◽

Thermal Neutron Flux ◽

Gamma Ray ◽

Dry Weight ◽

Gamma Ray Spectrometry ◽

Spectrometric Analysis ◽

Articular Disc ◽

Group Separation

SummaryBy means of neutron activation and gamma-ray spectrometry the concentrations in the human mandibular articular disc of the following elements have been determined: Na, Mn, Cu, Zn, Rb, Sr, Cd, W, and Au. The discs were obtained at necropsy from seven men and nine women, ranging in age from 56 to 71 years.The activation was carried out in a thermal neutron flux of about 1.7 XlO12 neutrons × cm−2 × sec.−1 for about 20 hours. A chemical group separationwas performed before the gamma-ray spectrometry. Quantitative data based on the dry weight of the cartilage samples were obtained by comparing the photo-peak area of the identified elements with those of appropriate standards.

Download Full-text