Document Details

Equipment and Procedures for Stack Gas Monitoring at ORNL
Subject Terms:
gamma, alpha, reactor; sampler, nuclear, beta; stack gas monitoring; waste, ORNL, stack
Document Location:
DOE INFORMATION CENTER 1 Way, Oak Ridge, TN 37831; Eva Butler; Phone: 865-241-4780; Toll-Free: 800-382-6938, Option 6; FAX: 865-574-3521; Email:
Document Categories:
Health, Safety and Environment\Waste Management
Document Type:
Publication Date:
1962 Feb 13
Declassification Status:
Never classified
Document Pages:
Accession Number:
Document Number(s):
ORNL-TM-141, Copy 26
Originating Research Org.:
Atomic Energy Commission
OpenNet Entry Date:
1998 Jun 16
This document concerns the equipment and procedures used for stack gas monitoring at ORNL. The Oak Ridge National Laboratory is engaged in a wide variety of operations related to nuclear research, development and production. Among these are the production of radioisotopes, the operation of nuclear reactors, and other activities which generate gaseous waste containing varying amounts of radioactivity. Routine monitoring of gaseous waste was started in 1956, when the installation of manually operated tape monitors was begun at each of three process stacks. In 1959, the development of a monitoring system was intensified and certain improvements were made to the Principal Stack. These included the addition of a step-moving tape monitor for better particulate detection, a charcoal trap monitor for adsorbable-gas detection, and an ion chamber detector in the off-gas system discharge, which carries the bulk of activity released into the stack. Inventory-type samplers, consisting of a filter and a charcoal cartridge, were placed on all stack samplers for the purpose of estimating stack activity discharges. In 1961, an experiment using a triple sample withdrawal probe with tape monitors, was initiated at the Principal Stack to establish the criteria for a new sample withdrawal system. A temporary in-stack sampler was installed to replace the less efficient external samplers and design is under way on a permanent installation which may be operated with greater simplicity and safety. An improved tape monitor which will give both beta/gamma and alpha detection, and which has many other advanced features, is planned for future use on the stack and on the ducts. The filter-charcoal cartridges will then be used on the smaller tributaries. A gross-gamma monitor, consisting of scintillation detectors mounted at the top of the stack, is in the concept stage. Figures are included.

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