Abstract
The Radon Calibration facility in Malaa is contaminated with Radium-226 (226Ra) which leaked from the original sources. Clean-up was conducted in 1988, but activity is estimated to remain on the inside of the pipes and on the floor of the room. As the plant will be decommissioned, it is important to determine the activity in the piping and on the floor in order to determine what which can be cleared and what needs to be cleaned up. The purpose of the measurement was to estimate the 226Ra-contamination in the piping and on the floor and to verify the estimates of the decontamination made in 1988. To estimate 226Ra activity in the pipe we measured the growth of radon concentrations in the closed plant by the instantaneous sampling with Lucas cells. Continuous sampling and measurement of radon growth was also made with an Atmos 12, as an additional measurement systems. Scanning of any 226Ra-contamination on the floor of the room was done using a gamma gauge and an alpha probe, which measured the alpha radiation. 226Ra-contamination on the inside of the pipes in the plant is estimated be between 80-90 kBq 226Ra with uncertainty around 9% (1 SD), a value reasonably
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Citation Formats
Moere, Hans, and Skeppstroem, Kirlna.
Determination of contamination with Radium-226 at the Radon Calibration plant at Malaa. Decision data for decontamination and decommissioning of the plant; Bestaemning av kontamination med Radium-226 i radonkalibreringsanlaeggningen i Malaa. Beslutsunderlag infoer sanering och avveckling av anlaeggningen.
Sweden: N. p.,
2011.
Web.
Moere, Hans, & Skeppstroem, Kirlna.
Determination of contamination with Radium-226 at the Radon Calibration plant at Malaa. Decision data for decontamination and decommissioning of the plant; Bestaemning av kontamination med Radium-226 i radonkalibreringsanlaeggningen i Malaa. Beslutsunderlag infoer sanering och avveckling av anlaeggningen.
Sweden.
Moere, Hans, and Skeppstroem, Kirlna.
2011.
"Determination of contamination with Radium-226 at the Radon Calibration plant at Malaa. Decision data for decontamination and decommissioning of the plant; Bestaemning av kontamination med Radium-226 i radonkalibreringsanlaeggningen i Malaa. Beslutsunderlag infoer sanering och avveckling av anlaeggningen."
Sweden.
@misc{etde_1008101,
title = {Determination of contamination with Radium-226 at the Radon Calibration plant at Malaa. Decision data for decontamination and decommissioning of the plant; Bestaemning av kontamination med Radium-226 i radonkalibreringsanlaeggningen i Malaa. Beslutsunderlag infoer sanering och avveckling av anlaeggningen}
author = {Moere, Hans, and Skeppstroem, Kirlna}
abstractNote = {The Radon Calibration facility in Malaa is contaminated with Radium-226 (226Ra) which leaked from the original sources. Clean-up was conducted in 1988, but activity is estimated to remain on the inside of the pipes and on the floor of the room. As the plant will be decommissioned, it is important to determine the activity in the piping and on the floor in order to determine what which can be cleared and what needs to be cleaned up. The purpose of the measurement was to estimate the 226Ra-contamination in the piping and on the floor and to verify the estimates of the decontamination made in 1988. To estimate 226Ra activity in the pipe we measured the growth of radon concentrations in the closed plant by the instantaneous sampling with Lucas cells. Continuous sampling and measurement of radon growth was also made with an Atmos 12, as an additional measurement systems. Scanning of any 226Ra-contamination on the floor of the room was done using a gamma gauge and an alpha probe, which measured the alpha radiation. 226Ra-contamination on the inside of the pipes in the plant is estimated be between 80-90 kBq 226Ra with uncertainty around 9% (1 SD), a value reasonably consistent with the estimated value from 1988 (120 kBq 226Ra). Alfa measurements on the floor showed that the floor is contaminated, but that activity is unevenly distributed across the surface. Alpha activity, which occurs in patches on the floor, is estimated to be below 2 kBq/m2 for 226Ra, a value that is far below the clearance limits of 10 kBq/m2 for 226Ra. Measurements and calculations of activity in the piping and on the floor is based on several assumptions (one of the more significant is the emanation factor of radon gas), which in turn leads to uncertainties in activity estimates}
place = {Sweden}
year = {2011}
month = {Jan}
}
title = {Determination of contamination with Radium-226 at the Radon Calibration plant at Malaa. Decision data for decontamination and decommissioning of the plant; Bestaemning av kontamination med Radium-226 i radonkalibreringsanlaeggningen i Malaa. Beslutsunderlag infoer sanering och avveckling av anlaeggningen}
author = {Moere, Hans, and Skeppstroem, Kirlna}
abstractNote = {The Radon Calibration facility in Malaa is contaminated with Radium-226 (226Ra) which leaked from the original sources. Clean-up was conducted in 1988, but activity is estimated to remain on the inside of the pipes and on the floor of the room. As the plant will be decommissioned, it is important to determine the activity in the piping and on the floor in order to determine what which can be cleared and what needs to be cleaned up. The purpose of the measurement was to estimate the 226Ra-contamination in the piping and on the floor and to verify the estimates of the decontamination made in 1988. To estimate 226Ra activity in the pipe we measured the growth of radon concentrations in the closed plant by the instantaneous sampling with Lucas cells. Continuous sampling and measurement of radon growth was also made with an Atmos 12, as an additional measurement systems. Scanning of any 226Ra-contamination on the floor of the room was done using a gamma gauge and an alpha probe, which measured the alpha radiation. 226Ra-contamination on the inside of the pipes in the plant is estimated be between 80-90 kBq 226Ra with uncertainty around 9% (1 SD), a value reasonably consistent with the estimated value from 1988 (120 kBq 226Ra). Alfa measurements on the floor showed that the floor is contaminated, but that activity is unevenly distributed across the surface. Alpha activity, which occurs in patches on the floor, is estimated to be below 2 kBq/m2 for 226Ra, a value that is far below the clearance limits of 10 kBq/m2 for 226Ra. Measurements and calculations of activity in the piping and on the floor is based on several assumptions (one of the more significant is the emanation factor of radon gas), which in turn leads to uncertainties in activity estimates}
place = {Sweden}
year = {2011}
month = {Jan}
}