Controlling of the Fiberboard's Surface Mass Using Gamma Radiation Back Scattering Technique
Cornel Poprscu, Sandn Patrascu, Alexandtu Kluger
"Hotia Htrlubei" National lnstitute for Physics and Nuclear Engineering,
IFIN HN, Bucharest, Romania.
ABSTRACT In order to carry out the quality assurance of fibreboard's manufacture, (in wood manufacturing industry) controlling of the fibreboard's surface mass is required.
World-wide, the usual radiotnetric gauges we based on gamma-ray transmission phenomena, using Am-241 radioactive source or X-ray radiation produced by controlled energy generators. In this paper, a measuring surface mass method based on gamma radiation back-scattering of a Am-241 source is presented. The method study results allowed the optimisation of the measuring geometry (source- measured material- detector ) in order to obtain maximum radiometric performances.
In this way, was determined the optimal distances between transducer surface and material, for that:
- the back-scattered radiation intensity is maximum
- the measuring signal dependency with this distances (that can have fluctuation during the technological process) is minimum.
The radiometric performances ( measuring sensibility, relative errors due the statistical fluctuations) was compared with the performed performances of thc transmission methods and was determined the measuring field for which this method is better. Also among the benefits of this method are the possibility to perform a transducers with a single block structure; relatively low size and weight, and that use only one material side during investigation. The paper presents the transducer model TRTT - GG - O1 (realised for this application in our institute) and the technical performances that are suitable with the technological requirements of the fibreboard's manufacture in wood manufacturing industry.
Publication Source: Proceedings of the 12th International Symposium on Nondestructive Testing of Wood University of Western Hungary, Sopron, 13-15 September 2000, ISBN 963 7180 88 5
Publisher: University of Western Hungary, H 9400 Sopron, P.O.Box 132, FAX: +36 99 311 103
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