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Title: Radiological Modeling for Determination of Derived Concentration Levels of an Area with Uranium Residual Material - 13533

Abstract

As a result of a pilot project developed at the old Spanish 'Junta de Energia Nuclear' to extract uranium from ores, tailings materials were generated. Most of these residual materials were sent back to different uranium mines, but a small amount of it was mixed with conventional building materials and deposited near the old plant until the surrounding ground was flattened. The affected land is included in an area under institutional control and used as recreational area. At the time of processing, uranium isotopes were separated but other radionuclides of the uranium decay series as Th-230, Ra-226 and daughters remain in the residue. Recently, the analyses of samples taken at different ground's depths confirmed their presence. This paper presents the methodology used to calculate the derived concentration level to ensure that the reference dose level of 0.1 mSv y-1 used as radiological criteria. In this study, a radiological impact assessment was performed modeling the area as recreational scenario. The modelization study was carried out with the code RESRAD considering as exposure pathways, external irradiation, inadvertent ingestion of soil, inhalation of resuspended particles, and inhalation of radon (Rn-222). As result was concluded that, if the concentration of Ra-226 in the firstmore » 15 cm of soil is lower than, 0.34 Bq g{sup -1}, the dose would not exceed the reference dose. Applying this value as a derived concentration level and comparing with the results of measurements on the ground, some areas with a concentration of activity slightly higher than latter were found. In these zones the remediation proposal has been to cover with a layer of 15 cm of clean material. This action represents a reduction of 85% of the dose and ensures compliance with the reference dose. (authors)« less

Authors:
 [1]
  1. CIEMAT, Avenida Complutense 40, 28040, Madrid (Spain)
Publication Date:
Research Org.:
WM Symposia, 1628 E. Southern Avenue, Suite 9-332, Tempe, AZ 85282 (United States)
OSTI Identifier:
22225105
Report Number(s):
INIS-US-13-WM-13533
TRN: US14V0684046060
Resource Type:
Conference
Resource Relation:
Conference: WM2013: Waste Management Conference: International collaboration and continuous improvement, Phoenix, AZ (United States), 24-28 Feb 2013; Other Information: Country of input: France; 8 refs.
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ABUNDANCE; BUILDING MATERIALS; COMPLIANCE; CONCENTRATION RATIO; DEPOSITS; INGESTION; INHALATION; ORES; RADIOECOLOGICAL CONCENTRATION; RADIUM 226; RADON; RADON 222; RECREATIONAL AREAS; REMEDIAL ACTION; SOILS; TAILINGS; THORIUM 230; URANIUM; URANIUM ISOTOPES; URANIUM MINES

Citation Formats

Perez-Sanchez, Danyl. Radiological Modeling for Determination of Derived Concentration Levels of an Area with Uranium Residual Material - 13533. United States: N. p., 2013. Web.
Perez-Sanchez, Danyl. Radiological Modeling for Determination of Derived Concentration Levels of an Area with Uranium Residual Material - 13533. United States.
Perez-Sanchez, Danyl. Mon . "Radiological Modeling for Determination of Derived Concentration Levels of an Area with Uranium Residual Material - 13533". United States.
@article{osti_22225105,
title = {Radiological Modeling for Determination of Derived Concentration Levels of an Area with Uranium Residual Material - 13533},
author = {Perez-Sanchez, Danyl},
abstractNote = {As a result of a pilot project developed at the old Spanish 'Junta de Energia Nuclear' to extract uranium from ores, tailings materials were generated. Most of these residual materials were sent back to different uranium mines, but a small amount of it was mixed with conventional building materials and deposited near the old plant until the surrounding ground was flattened. The affected land is included in an area under institutional control and used as recreational area. At the time of processing, uranium isotopes were separated but other radionuclides of the uranium decay series as Th-230, Ra-226 and daughters remain in the residue. Recently, the analyses of samples taken at different ground's depths confirmed their presence. This paper presents the methodology used to calculate the derived concentration level to ensure that the reference dose level of 0.1 mSv y-1 used as radiological criteria. In this study, a radiological impact assessment was performed modeling the area as recreational scenario. The modelization study was carried out with the code RESRAD considering as exposure pathways, external irradiation, inadvertent ingestion of soil, inhalation of resuspended particles, and inhalation of radon (Rn-222). As result was concluded that, if the concentration of Ra-226 in the first 15 cm of soil is lower than, 0.34 Bq g{sup -1}, the dose would not exceed the reference dose. Applying this value as a derived concentration level and comparing with the results of measurements on the ground, some areas with a concentration of activity slightly higher than latter were found. In these zones the remediation proposal has been to cover with a layer of 15 cm of clean material. This action represents a reduction of 85% of the dose and ensures compliance with the reference dose. (authors)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2013},
month = {7}
}

Conference:
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