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in creator/contributor: "Meyer, K.E."

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Assays and screening of alpha contaminated soils using low-resolution alpha spectroscopy of thick soil samples

A new approach to estimating concentrations of alpha-emitting contaminants (e.g. U, Th, Ra, Pu, Am) in soil samples has been evaluated. The Victoreen Alpha Activity Monitor has been designed to empirically assay soil samples using low-resolution alpha spectroscopy, of thick soil samples. Pre-processing of the soil samples is minimal, involving only drying the soils and milling them to reduce inhomoceneities. Several laboratory tests of the instrument have been conducted. It has been shown that … more

Date: April 1, 1995

Creator: Meyer, K. E.; Lucas, A. C. & Padovan, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Passive field monitoring of plutonium and americium in soil

The authors` progress is described in applying passive alpha track detectors (ATDS) and electret ion chambers (EICS) to in-situ field monitoring of soils contaminated with particulate plutonium and americium at a desert site. By varying the exposure times, from a few minutes to about one day, they quantitatively measured alpha activity varying between {approximately} 100 pCi/g and {approximately} 100 nCi/g. Suggested applications are definition of the boundaries of contamination zones and verif… more

Date: December 31, 1994

Creator: Gammage, R. B.; Meyer, K. E. & Dudney, C. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Field demonstrations of passive detectors for screening of alpha contaminated soils

There are numerous sites around the country, DOE and otherwise, that are faced with the daunting task of remediating radiologically contaminated soils and groundwaters. Some of these sites, such as the Nevada Test Site and the Rocky Flats Plant, have contaminants that have been dispersed over wide areas. The costs of the characterization phase alone for such remediation programs can be prohibitive. Therefore there are pressing needs for testing and evaluation of new technologies for screening f… more

Date: May 1, 1994

Creator: Meyer, K. E.; Gammage, R. B. & Dudney, C. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Non-conventional passive sensors for monitoring tritium on surfaces

The authors describe development of small passive, solid-state detectors for in-situ measurements of tritium, or other weak beta-emitting radionuclides, on surfaces. One form of detector operates on the principle of thermally stimulated exoelectron emission (TSEE), the other by discharge of an electret ion chamber (EIC). There are currently two specific types of commercially available detector systems that lend themselves to making surface measurements. One is the thin-film BeO on a graphite di… more

Date: June 1, 1995

Creator: Gammage, R.B.; Brock, J.L. & Meyer, K.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Laser induced fluorescence imaging of thermal damage in polymer matrix composites

A simple, fluorescence-based imaging system was developed for identifying regions of thermal damage in polymer-matrix composites (PMCs). PMCs have important applications where low weight and high mechanical strength are needed. One concern in the aerospace industry is the tendency of some PMC materials to become irreversibly damaged when exposed to high temperatures. Traditional nondestructive evaluation (NDE) techniques are capable of detecting physical flaws, such as cracks and delaminations,… more

Date: December 31, 1996

Creator: Wachter, E.A.; Fisher, W.G. & Meyer, K.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Evaluation of passive alpha detectors for sensitive/inexpensive/fast characterization of radiological contamination on surfaces and in soils

Passive alpha-particle detectors, originally developed for indoor radon measurements, offer the potential for cost-effective and sensitive measurements of radiological contamination in soils and on surfaces for field screening and radiological survey applications. We have carried out field demonstrations of electret ionization chambers (EIC`s) and alpha track detectors (ATD`s). The EIC`s offer the advantages of immediate on-site readout, good sensitivity, ruggedness, and simplicity of operation… more

Date: April 1, 1994

Creator: Meyer, K. E.; Gammage, R. B.; Dudney, C. S.; Kotrappa, P.; Wheeler, R. & Salasky, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Use of passive alpha detectors to screen for uranium contamination in a field at Fernald, Ohio

This paper reports the results from a field test of newly developed techniques for inexpensive, in situ screening of soil for alpha contamination. Passive alpha detectors that are commercially available for the detection indoor airborne alpha activity (i.e., {sup 222}Rn) have been modified so they can be applied to the detection of alpha contamination on surfaces or in soils. Results reported here are from an intercomparison involving several different techniques with all measurements being mad… more

Date: June 1995

Creator: Dudney, C. S.; Meyer, K. E.; Gammage, R. B.; Wheeler, R. V.; Salasky, M. & Kotrappa, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

In Situ NDA Conformation Measurements Performed at Auxiliary Charcoal Bed and Other Main Charcoal Beds After Uranium Removal from Molten Salt Reactor Experiment ACB at Oak Ridge National Laboratory

The Molten Salt Reactor Experiment (MSRE) site is located in Tennessee, on the U.S. Department of Energy (DOE) Oak Ridge Reservation (ORR). The MSRE was run by Oak Ridge National Laboratory (ORNL) to demonstrate the desirable features of the molten-salt concept in a practical reactor that could be operated safely and reliably. It introduced the idea of a homogeneous reactor using fuel salt media and graphite moderation for power and breeder reactors. The MSRE reactor and associated components a… more

Date: February 26, 2002

Creator: Haghighi, M. H.; Kring, C. T.; McGehee, J. T.; Jugan, M. R.; Chapman, J. & Meyer, K. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department