Isotopic correlation analysis is believed to make possible quick and accurate determinations of nuclear fuel parameters for
reactor operation, reprocessing, fuel management and nuclear safeguards. Correlation dependencies have been found between
ratios of fission products on the one hand and isotope ratios of the heavy elements on the other hand. The use of the154Eu/155Eu ratio in correlation analysis was proposed by SMULEK. The scope of useful applications of this isotopic ratio has been
further investigated. A quick and time-saving method to measure the154Eu/155Eu ratio has been elaborated. The atomic ratios have been found by internal calibration using the computer programme ABSINT.
Beside this the atomic ratios of154Eu/155Eu as a function of nuclear fuel burn-up have been calculated using the computer programme ISOTOP.
The correlation between the154Eu/155Eu ratio and nuclear fuel burn-up is best approximated by a quadratic function. Up to a burn-up of 1% fima a linear function
can be used.
Authors:Qiang Xu, Andrea Majlingova, Martin Zachar, Cong Jin, and Yong Jiang
correlation calculation. Correlationanalysis could be used in data mining of cone calorimeter data to derive more useful information on studying of fire behaviour of materials.
The research was supported by the Natural Science Fund of
Authors:Cairong Luo, Jie Liu, Yan Liang, Xiangchun Shen, Xiaoyan Zhang, and Wei Zhou
490 nm was determined by a microplate reader (Bio-Rad Laboratories, Inc.), the inhibitory rate (%) was finally calculated by the following formula: Inhibitory rate ( % ) = OD Blank − OD Sample OD Blank × 100 % Correlationanalysis Quantitative
Thirty-three sediment samples from four shoreline and three sea positions in a defined sampling grid around the Bushehr Nuclear
Power Plant (BNPP) have been taken over six sampling periods during 1996-1997. Elemental analysis of the samples has been
performed with neutron activation and concentrations of seventeen elements have been obtained. Cross-correlation analysis
has been carried out and four categories of related elements have been defined.
Authors:S. Shibata, E. Kawano, K. Kimura, T. Mine, and M. Harada
14C dating of 6 Japan cedars having the relative growing ages were made. On the basis of correlation analysis of our data to
a14C age data set, INTCAL of CALIB (Stuiver), the growing ages of these Japan cedars were estimated (BC 1090-2375). The atmospheric14C concentration (Δ14C) at their growing ages were obtained from the14C age data. The variation of Δ14C shows basically the same pattern with that of Europe or America (r=0.783).
Samples of the mussel Mytilus edulis were collected from different sites of estuarine and coastal areas of the North Sea and
the Baltic. The following elements were determined by IN Ca, Sc, Cr, Fe, Co, Ni, Zn, As, Se, Br, Rb, Sr, Zr, Ag, Cd, Sn,
Cs, Ba, Ta, Eu, Tb, Yb, Hf, Au, Hg, Th. Multielement correlation analysis was used for the evaluation of the data. Differences
in trace element patterns are found and described calculating trace element ratios. Regional differences in trace element
concentrations are superimposed by typical seasonal variations, with highest concentration levels found in late winter and
spring, and lowest in summer and autumn.
Authors:D. Robertson, V. Thomas, H. Rieck, D. Haggard, W. Reece, J. Pappin, W. Hensley, D. Brown, C. Thomas, and P. Robinson
Battelle, Pacific Northwest Laboratories has recently developed, tested and field-demonstrated a technology for the direct assay of transuranic radionuclides (TRU), fission products, and activation products in a variety of radwaste packages generated at commercial nuclear power plants. This technology involves non-destructive passive neutron counting for determination of nanocurie/gram quantities of the TRU radionuclides. Direct gamma spectrometry combined with thermoluminescent dosimetry (TLD) and correlation analysis is also utilized to determine the concentrations of the fission and activation products present in the radwaste packages. Employing counting times of 10 to 20 minutes, a complete analysis of all radionuclides specified for assay by the U.S. Nuclear Regulatory Commission (in 10CFR61) prior to shallow-land disposal of commercial radwastes can be measured at concentrations at least tenfold below the least restrictive Class A waste catagory.
Studies were conducted to measure the effect of irradiation treatment on thermoluminescence (TL) values in dried fruits such
as apricots, dates and raisins. For this purpose, inorganic dust particulate (minerals) adhering to the fruit surface was
collected from untreated and treated (0.5, 1.0 and 1.5 kGy) samples. The TL responses of the isolated minerals was measured
in the temperature range of 80–320°C at an increasing rate of 10°C/s. It was observed that peak of the TL signals appeared
at 200°C in each case and generally the magnitude of the peak signals was almost 103 times that of unirradiated samples. Regression and correlation analysis of the data indicated strong relationship between
radiation absorbed dose and TL values at each temperature (r≥0.98). It was concluded that TL measurements could serve as a fast and reliable method for distinguishing as well as determining
absorbed dose in irradiated dried apricot, date and raisin.