This Conference is the fourth in a series of conferences organized by staff members of Oak Ridge National Laboratory in an effort to improve communication in the field of radiation protection and dosimetry. Scientists, regulators, managers, professionals, technologists, and vendors from the United States and countries around the world have taken advantage of this opportunity to meet with their contemporaries and peers in order to exchange information and ideas. The program includes over 100 papers in 9 sessions, plus an additional session for works in progress. Papers are presented in external dosimetry, internal dosimetry, radiation protection programs and assessments, developments in instrumentation and materials, environmental and medical applications, and on topics related to standards, accreditation, and calibration. Individual papers are indexed separately on EDB.

Lasers plasma instabilities are an important constraint in x-ray driven inertial confinement fusion. In hohlraums irradiated with 1.06 {mu}m light on the Shiva laser, plasma instabilities were extremely deleterious, driving the program to the use of shorter wavelength light. Excellent coupling has been achieved in hohlraums driven with 0.35 {mu}m light on the Nova laser. Considerable attention is being given to the scaling of this excellent coupling to the larger hohlraums for an ignition target. Various instability control mechanisms such as large plasma wave damping and laser beam incoherence are discussed, as well as scaling experiments to check the instability levels.

Ames laboratory will develop an integrated sampling and analysis system suitable for on-line monitoring of hydrogen chloride (HCl) and mercury (Hg) in advanced coal gasifiers. The objectives of this project are to (1) summarize current technology for monitoring HCl and Hg in gaseous effluents, (2) identify analytical techniques for such determinations in high-temperature, high-pressure gases from coal-based systems of interest to METC for producing electrical power, (3) evaluate promising analytical approaches, and (4) produce reliable on-line monitors which are adaptable to plant-scale diagnostics and process control.

This report contains papers on the following topics: Recent results on the semi-leptonic decay Decay D{sup 0} {yields} K{sup {minus}}{mu}{sup +}{nu}{sub {mu}}; charmed mesons; observation of the Decay {Omega}{sub c}{sup 0}{Sigma}{sup +}K{sup {minus}}K{sup {minus}}{phi}{sup +}; the physics of charm lifetimes; and photoproduction of charmed hadrons. These papers have been cataloged separately.

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This report documents maximum scan speeds to maintain the minimum detectable activity (MDA) of Hanford contamination survey instruments at one times or three times the total contamination value. Scan speeds are interpolated from empirically derived minimum detectable count rates (MDCR) for beta/gamma and alpha contamination survey instruments. The MDCRs were measured using distributed contamination sources. The instruments tested were a 15.5-cm{sup 2} pancake Geiger-Mueller (GM) detector, a 100-cm{sup 2} gas proportional detector, and a 50-cm{sup 2} Hanford portable alpha meter (PAM). The MDCR for a scanning survey is highly dependent on survey technique. Scanning surveys at Hanford are performed by scanning the surface with the probe held a maximum of 6 mm (1/4 in.) away from the surface. If an increase above background is noted, the technician pauses for 5 to 10 seconds. For this evaluation, any counts detected with an alpha survey instrument are treated as an increase above background (assumed to be 0 cpm). During the 5- to 10-second count, if additional counts are detected, the area is assumed to be contaminated. Methods for calculating the MDA were previously developed and reported in Goles et al. (1991). This report also provides MDAs for a 5-second static count with …