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Study of radon-222 emanation from sedimentary phosphates and corresponding phosphogypsum. Temperature effect; Etude de l` emanation en radon-222 de phosphates sedimentaires et de phosphogypses correspondants. Effet de la temperature

Thesis/Dissertation:

Abstract

The aim of this study is to examine the effect of temperature on radon emanation from the phosphates of various regions of Morocco, from corresponding phosphogypsum and from teeth fossilized of Youssoufia phosphate. The interpretation of obtained results was carried out by the physicochemical studies with various approaches; the X-ray diffraction analysis, the measurement of the specific surface area and porousness, the determination of the oxygen content by activation analysis with 14 MeV neutron. The thermal treatment between 100 and 900 degrees C conducted to the following points: - An increase of the radon degassing rate, which is first slow when the temperature increase from 20 to 600 degrees C, then becomes brutal beyond this temperature. We attributed this variation to the training effect ( transport effect ) of radon by the others gas susceptible to be released with thermal effect, particularly the CO sub 2. - The reduction of the radon emanation power versus temperature. We could demonstrate a linear correlation between the power emanation and the specific surface area. 122 refs., 102 figs., 20 tabs. (Author).
Authors:
Publication Date:
Jul 16, 1993
Product Type:
Thesis/Dissertation
Report Number:
INIS-mf-14415
Reference Number:
SCA: 540230; PA: AIX-26:010173; EDB-95:031288; SN: 95001323616
Resource Relation:
Other Information: TH: These (D.E.S.).; PBD: 16 Jul 1993
Subject:
54 ENVIRONMENTAL SCIENCES; MOROCCO; PHOSPHATES; RADON 222; EMANATION METHOD; TEMPERATURE DEPENDENCE; APATITES; CRYSTAL STRUCTURE; EXPERIMENTAL DATA; NATURAL RADIOACTIVITY; NEUTRON ACTIVATION ANALYSIS; POROSITY; SPECIFIC SURFACE AREA; X-RAY DIFFRACTION; 540230; RADIOACTIVE MATERIALS MONITORING AND TRANSPORT
OSTI ID:
10111193
Research Organizations:
Universite Mohammed 5, Rabat (Morocco). Faculte des Sciences
Country of Origin:
Morocco
Language:
French
Other Identifying Numbers:
Other: ON: DE95612386; TRN: MA9400065010173
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
186 p.
Announcement Date:
Jun 30, 2005

Thesis/Dissertation:

Citation Formats

Boujrhal, F M. Study of radon-222 emanation from sedimentary phosphates and corresponding phosphogypsum. Temperature effect; Etude de l` emanation en radon-222 de phosphates sedimentaires et de phosphogypses correspondants. Effet de la temperature. Morocco: N. p., 1993. Web.
Boujrhal, F M. Study of radon-222 emanation from sedimentary phosphates and corresponding phosphogypsum. Temperature effect; Etude de l` emanation en radon-222 de phosphates sedimentaires et de phosphogypses correspondants. Effet de la temperature. Morocco.
Boujrhal, F M. 1993. "Study of radon-222 emanation from sedimentary phosphates and corresponding phosphogypsum. Temperature effect; Etude de l` emanation en radon-222 de phosphates sedimentaires et de phosphogypses correspondants. Effet de la temperature." Morocco.
@misc{etde_10111193,
title = {Study of radon-222 emanation from sedimentary phosphates and corresponding phosphogypsum. Temperature effect; Etude de l` emanation en radon-222 de phosphates sedimentaires et de phosphogypses correspondants. Effet de la temperature}
author = {Boujrhal, F M}
abstractNote = {The aim of this study is to examine the effect of temperature on radon emanation from the phosphates of various regions of Morocco, from corresponding phosphogypsum and from teeth fossilized of Youssoufia phosphate. The interpretation of obtained results was carried out by the physicochemical studies with various approaches; the X-ray diffraction analysis, the measurement of the specific surface area and porousness, the determination of the oxygen content by activation analysis with 14 MeV neutron. The thermal treatment between 100 and 900 degrees C conducted to the following points: - An increase of the radon degassing rate, which is first slow when the temperature increase from 20 to 600 degrees C, then becomes brutal beyond this temperature. We attributed this variation to the training effect ( transport effect ) of radon by the others gas susceptible to be released with thermal effect, particularly the CO sub 2. - The reduction of the radon emanation power versus temperature. We could demonstrate a linear correlation between the power emanation and the specific surface area. 122 refs., 102 figs., 20 tabs. (Author).}
place = {Morocco}
year = {1993}
month = {Jul}
}