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Fusion Science and Technology
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Demolition starts at ORNL’s Isotope Row
The Department of Energy reported last week that the demolition of Isotope Row at Oak Ridge National Laboratory has begun. The demolition work follows six years of targeted decontamination efforts and is expected to be completed by the end of this year.
Isotope Row is a group of 10 facilities constructed at ORNL between the late 1940s and early 1960s for the production of radioisotopes that were used in medical, industrial, scientific, and defense applications. Isotope production stopped in the early 1990s, leaving behind buildings with contaminated ventilation systems, hot cells, and other equipment requiring specialized cleanup operations and teardown.
Om Prakash Joneja, P. Scherrer, J.-P. Schneeberger
Fusion Science and Technology | Volume 24 | Number 2 | September 1993 | Pages 180-187
Technical Paper | Blanket Engineering | doi.org/10.13182/FST93-A30224
Articles are hosted by Taylor and Francis Online.
At the LOTUS facility, an extremely efficient online detector system, based on the detection of the charged particles associated with the 6Li(n, α)t reaction, has been designed, fabricated, and tested. The system offers an interesting possibility for directly measuring the tritium production rate (TPR) at any experimental site. The charged particles emitted in opposite directions can be detected by a double parallel plate ionization chamber (DIC) configuration. The real events are identified by employing a coincidence circuit. The complete fabrication details, testing under different conditions, measurement of TPR, and its comparison with the liquid-scintillation method (LSM) are detailed. The DIC response to thermal neutrons agrees well with the theoretical calculations. Also, the detector system is insensitive to a contact gamma dose rate of 1.3 rem/h. The direct TPR measurements and the salient feature of higher efficiency in comparison with the LSM are demonstrated. The TPR determined by both methods are in excellent agreement.
