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Evaluation of alkaline etchants for printed wiring boards

Description: A propietary, alkaline copper-ammonia complex etchant was evaluated for use in production of printed wiring boards (PWBs). A better etchant than the standard chromic-sulfuric acid etchant was needed because of the numerous disadvantages associated with use of the latter. Testing of the alkaline etchant involved etching identical circuit patterns with both etchants, micro-sectioning samples, and measuring conductor widths. There was little dimensional difference between the two systems. Inspection of the panels etched in the alkaline etchant indicated that conductor widths were within dimensional tolerances and that undercutting of the masking was less than expected. Parts masked with tin-lead plate and alkaline etched were tested for solderability; results were excellent. Because of this evaluation, the production process was changed to incorporate the alkaline etchant. It has been used for production etching of PWBs since June 1973.
Date: September 1, 1976
Creator: Evans, M. E.
Partner: UNT Libraries Government Documents Department

Applications of LabVIEW programming in a glovebox environment

Description: When dealing with neutron radiation one of the keys to reducing worker exposure is to have as much distance and shielding between the radiation and the radiation worker as possible. Using a PC to control a process from a remote location allows the distance between the radiation worker and the radiation source to be increase. Increasing the distance at which radiation worker can control a process allows more shielding to be placed around the glovebox. There are many commercial packages that allow controlling remote processes with a PC. This paper shows how flexible the LabVIEW Graphical Programming Language can be in implementing the remote control of glovebox process.
Date: September 1, 1995
Creator: Evans, M. E.; Peralta, G. & Gray, D.
Partner: UNT Libraries Government Documents Department

A new glove for glovebox workers

Description: Lead-lined gloves used during the processing of nuclear materials within gloveboxes is an example of a barrier. To help prevent work contamination, current practice includes visual inspection and radiological monitoring of each glove on a regular basis. One administrative control requires radiological workers to monitor their hands upon removal form the glovebox gloves. In reality, either a catastrophic glove failure or the formation of pinholes can cause contamination which is detected after the fact. Real-time monitoring of glove integrity during use would help prevent the spread of contamination, minimize decontamination costs, and protect the glovebox worker. Another benefit of real-time monitoring is remotely alerting proper personnel of a glovebox glove breech. One of the most exciting aspects of this technology is the rapid detection of a breech in the glovebox glove. A puncture to a glove can be detected followed by an alert to a worker in less than a second. The benefits of a real-time monitoring system for glove integrity are immense. Examples of benefits using this new glove are: reducing work stoppage, personnel contamination, glovebox glove replacements, and the filing of costly reports. The primary application of this technology at Los Alamos National Laboratory would be protecting the worker with these newly designed lead-lined gloves.
Date: October 1, 1996
Creator: Macdonald, J. M.; Nekimken, H .L.; Hermes, R. E.; Castro, J. M. & Evans, M. E.
Partner: UNT Libraries Government Documents Department