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Report for Assessment of Non-Destructive Decontamination Methodologies for Mixed Porous Surfaces: Aging of Technology under High Humidity and UV Conditions
Citation:
Hall, K. Report for Assessment of Non-Destructive Decontamination Methodologies for Mixed Porous Surfaces: Aging of Technology under High Humidity and UV Conditions. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-20/125, 2020.
Impact/Purpose:
. In 2015, EPA and Battelle conducted an operational demonstration of two strippable coating (SC) decontamination technologies, Strip coat TLC Free™ SC (Strip coat) and DeconGelTM 1128 SC (DeconGel). During this demonstration (which occurred during the summer), Strip coat and DeconGel were sprayed onto a brick building and allowed to dry for approximately 24 hours. Following the drying step, the coatings were unable to be removed from the brick surface. To understand the reason and assess the limitations of using the two coatings on brick surfaces, HSRP evaluated the performance of Stripcoat and DeconGel under controlled elevated temperature (T), relative humidity (RH), and ultra-violet (UV) light conditions to determine if environmental conditions had an effect on coating removal. The research included observation of the operational removal of the strippable coatings as well as determination of the efficacy for the removal of radioactive Cesium-137 (Cs-137) from aged mixed porous surfaces. The results showed that UV had little effect on removal of the coatings however humidity did have an effect in making it easier to remove the coatings under longer exposure duration. In addition, aged brick was use for the research and it was found that age of brick had an effect on contaminant removal. The information from this research will be usable by decision makers after a radiological incident in determining the whether the strippable coatings tested can be used in their communities based on their general environmental conditions.
Description:
Report: Evaluation of the performance of Strip coat and DeconGel under controlled elevated temperature (T), relative humidity (RH), and ultra-violet (UV) light conditions. The research included observation of the operational removal of the strippable coatings as well as determination of the efficacy for the removal of radioactive Cesium-137 (Cs-137) from aged mixed porous surfaces.