Skip Navigation

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (6)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Pradhan, A.S.
Right arrow Articles by Bihari, R.R.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Pradhan, A.S.
Right arrow Articles by Bihari, R.R.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Radiation Protection Dosimetry 85:67-70 (1999)
© 1999 Oxford University Press

Parameters of Large Scale Production of Personnel Monitoring TLD Cards Based on CaSO4:Dy

A.S. Pradhan, A.K. Bakshi, K. Srivastava and R.R. Bihari

In India, more than 100,000 TLD cards are currently in use for routine monitoring of about 30,000 radiation workers. Stringent quality assurance parameters are introduced at three levels during the production of TLD cards. (1) CaSO4:Dy TLD phosphor of grain size <75 µm having a sensitivity in the production batches (each of 600 g) within ± 5%; (2) CaSO4:Dy Teflon TLD discs showing a sensitivity within ± 8%; and (3) TLD cards having a sensitivity within ± 12%. Significant batch to batch variations were observed for the same preparation procedure and starting materials. The glow peak height ratio of the main glow peak and lower temperature satellite peaks was found to vary by more than a factor of 4 while the TL sensitivity was found to seldom vary by more than 20%. The variation of glow peak height ratio with grain size was more pronounced in some batches while no significant change was observed in some other batches. This was attributed to the variation in the extent of diffusion of impurities into the lattice during preparation of the phosphor. Testing of each batch of phosphor in the range of grain sizes that were as close as possible to those actually used was found to be crucial and a necessary parameter. Important parameters for keeping the sensitivity of different batches of TLDs the same are the availability of bulk CaSO4.2H2O powder having trace impurities within specified limits, constant vigil on the method of phosphor preparation, detailed testing for the selection of phosphor batches, and sample testing of TLD discs and cards.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 Radiat Prot DosimetryHome page
A. S. Pradhan and A. K. Bakshi
Glow peak temperature, supralinearity and LET dependence of TLDs--correlation studies
Radiat Prot Dosimetry, September 1, 2006; 119(1-4): 276 - 279.
[Abstract] [Full Text] [PDF]

Home page
 Radiat Prot DosimetryHome page
A. K. Bakshi, A. S. Pradhan, A. K. Tyagi, R. K. Kher, and B. C. Bhatt
Correlation of phase transition with the change in TL characteristics in CaSO4:Dy phosphor--effect of thermal treatment
Radiat Prot Dosimetry, September 1, 2006; 119(1-4): 139 - 142.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.