The underwater coincidence counter for plutonium measurements in mixed-oxide fuel assemblies manual

Abstract

Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. TABLE OF CONTENTS .

Introduction to Neutron Coincidence Counter Design Based on Boron-10

“…The UWCC can be applied to either boiling-water reactor (BWR) or pressurized-water reactor (PWR) fuel assemblies to determine plutonium loading per unit length to a accuracy of less than 1% in a measurement time of 120-180 s [Eccleston 1998;Eccleston 1999]. The example of a UWCC seen in Figure 3.4 consists of two detector slabs, each containing four 3 He tubes, to be placed around fresh MOX fuel in a water pool.…”

An Investigation into the Use of Low-Frequency Dielectric Spectroscopy as a Means of Characterizing the Structure of Creams Based on Aqueous Cream BP

“…The most commonly applied methods of characterization are rheological and microscopic, although techniques such as thermogravimetric analysis and differential scanning calorimetry have also been used. [5][6][7][8] A limited number of studies have used dielectric analysis in the investigation of these systems, whereby an oscillating electric field is applied to a sample over a range of frequencies and the response measured in terms of the inphase and out-of-phase polarization, thereby yielding a characteristic spectra which may provide information via both the absolute values obtained at each frequency and the spectral shape; further information on the technique is available from a number of texts. [9][10][11] The technique has been shown to have considerable potential for the characterization of liquid crystalline systems, [12][13][14][15] particularly as the technique is effectively noninvasive (which is important when studying delicate systems such as cream microstructures).…”