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Title: Radon Measurements at the Molten Salt Reactor Experiment (MSRE) Facility from August 1997 through April 1998

From August 1997 through April 1998, radon and radon progeny measurements were collected at the Molten Salt Reactor Experiment (MSRE) facility at Oak Ridge National Laboratory. The purpose of the measurements was to determine the baseline concentrations of 222Rn (radon), 220Rn (thoron), and their progeny in the air at selected points with emphasis on the characterization of 220Rn and its daughter products in the high bay area. The daughter product concentrations ranged from the equivalent of approximately 0.001 times the derived air concentration (DAC) of the isotope mixture up to 0.09 DAC, with the highest measurements occurring inside the pit above the equipment drain tank cell. Direct radon measurements in this area indicated a relatively constant 222Rn concentration with an average value of 1.4 pCi/L and a 220Rn concentration that fluctuated from <1 pCi/L up to about 30 pCi/L. Measurements were also collected inside the vent house adjacent to building 7503. The progeny concentrations inside the room ranged from an equivalent of about 0.002 DAC up to 0.01 DAC. The direct radon measurements in the vent house indicated a relatively constant 222Rn concentration with an average value of 0.7 pCi/L while the 220Rn concentration varied appreciably and ranged from <0.5more » pCi/L up to almost 200 pCi/L with an average concentration of 18 pCi/L.« less
Authors:
Publication Date:
OSTI Identifier:
6689
Report Number(s):
ORNL/TM-13716
TRN: US0101882
DOE Contract Number:
AC05-96OR22464; AC05-98OR22700
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Apr 1999
Research Org:
Oak Ridge National Lab., TN (US)
Sponsoring Org:
USDOE Office of Environment, Safety and Health (EH) (US)
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 54 ENVIRONMENTAL SCIENCES; DAUGHTER PRODUCTS; MSRE REACTOR; RADON 220; RADIATION MONITORING; RADON 222; RADIOECOLOGICAL CONCENTRATION; INDOOR AIR POLLUTION