[Home ] [Archive]    
:: Main :: About :: Current Issue :: Archive :: Search :: Submit :: Contact ::
:: Volume 3, Issue 4 (March 2006) ::
Int J Radiat Res 2006, 3(4): 171-176 Back to browse issues page
Alpha radioactivity in Indian cement samples
M. Nain , R.P. Chauhan, S.K. Chakarvarti
, mnain@rediffmail.com
Abstract:   (24146 Views)

ABSTRACT  

Background: The essential constituents of cements like lime, silica and alumina are derived from earth’s crust in which radioactive elements like uranium, thorium etc are also present in varying amounts almost everywhere. These two elements are considered as the parent elements of uranium and thorium radioactive decay series in which radon and thoron are produced respectively as decay products. In the present study the samples of ordinary Portland cement (OPC), Portland pozzolana cement (PPC) and some other cementious finishing materials like white cement, Plaster of Paris (POP), cement putty etc were collected and analysed for radium and radon concentrations along with radon exhalation rates.

  Materials and Methods: Alpha sensitive LR-115 Type II plastic track detectors commonly known as “Solid State Nuclear Track Detectors” were used to measure the radium and radon concentration. The alpha particles emitted from the radon causes the radiation damaged tracks. The Chemical etching in NaOH at 60 ° C for about 90 minutes was done to reveal these latent tracks, which were then scanned and counted by an optical microscope of suitable magnification. By calculating the track density of registered tracks, the radon and radium concentrations along with exhalation rate of radon, were determined using required formulae.

  Results: The radon and radium concentration in various brands of cements found to vary from 333 ±9.9 to 506 ±13.3 Bq m–3 and from 3.7 ± 0.1 to 5.6 ± 0.2 Bq kg–1 while in various cementious finishing materials used in the construction, these were found to vary from 378 ±19.7 to 550 ± 9.8 Bq m–3 and from 4.2 ± 0.2 to 6.1 ± 0.1 Bq Kg–1, respectively. Based on the data the mass and surface exhalation rates were also calculated.

  Conclusion: The measurements indicate that there is marginal variation of the concentration of radium and radon in various brands of cements in India with lower levels in the cement samples having red oxide and higher levels in fly ash based cement samples but overall concentration levels of radon and radium are lower than that of average global values.

Keywords: Portland cement, radioactivity, radon concentration, nuclear tracks, exhalation rate
Full-Text [PDF 87 kb]   (3784 Downloads)    
Type of Study: Original Research | Subject: Radiation Biology
Send email to the article author

Add your comments about this article
Your username or Email:

CAPTCHA


XML     Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

M. Nain, R.P. Chauhan, S.K. Chakarvarti. Alpha radioactivity in Indian cement samples. Int J Radiat Res. 2006; 3 (4) :171-176
URL: http://ijrr.com/article-1-189-en.html


Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Volume 3, Issue 4 (March 2006) Back to browse issues page
International Journal of Radiation Research
Persian site map - English site map - Created in 0.04 seconds with 32 queries by YEKTAWEB 4410