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Use of three new SSNTD methods for evaluating thorium contents in different building materials and measuring thoron and its progeny concentrations inside dwellings.
MedLine Citation:
PMID:  12150289     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Three new methods based on using CR-39 and LR- 115 type II solid state nuclear track detectors (SSNTD) were used for measuring thorium concentrations (in 10(-6)g/g (ppm)) inside different building materials and evaluating the resulting concentrations of thoron and its progenies in dwellings built by the studied materials. The first technique consists of determining the probabilities for alpha-particles emitted by the uranium and thorium series inside the building materials or by the radon and thoron groups inside the dwelling atmosphere to reach and be registered as tracks on the SSNTD utilized and exploiting the resulting track density rates. The second method consists of evaluating the mean critical angles of etching of the CR-39 and LR-115 II SSNTD and measuring the resulting track densities registered on the detectors utilized. The third technique is based on calculating the detection efficiencies of the CR-39 and LR-115 II SSNTD for a-particles emitted by the uranium and thorium series in the building materials or by the radon and thoron groups in air and measuring track density rates registered on these detectors. The influence of the building material's nature and ventilation rate on the thoron and its decay products inside the dwelling rooms studied has been investigated.
Authors:
M A Misdaq
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine     Volume:  57     ISSN:  0969-8043     ISO Abbreviation:  Appl Radiat Isot     Publication Date:  2002 Aug 
Date Detail:
Created Date:  2002-08-01     Completed Date:  2002-08-26     Revised Date:  2003-11-03    
Medline Journal Info:
Nlm Unique ID:  9306253     Medline TA:  Appl Radiat Isot     Country:  England    
Other Details:
Languages:  eng     Pagination:  285-9     Citation Subset:  -    
Affiliation:
Nuclear Physics and Techniques Laboratory, Faculty of Sciences Semlalia, University Cadi Ayyad, Marrakech, Morocco. misdaq@ucam.ac.ma
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