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Radiation Protection Dosimetry Advance Access published online on January 6, 2005
Radiation Protection Dosimetry, doi:10.1093/rpd/nch442
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Radiation Protection Dosimetry © Oxford University Press 2004; all rights reserved
Received June 3, 2004
Revised November 29, 2004
Accepted December 5, 2004

SCIENTIFIC NOTE

EVALUATION OF THE NEW GRADED Z LINER IN THE HUMAN MONITORING LABORATORY'S LUNG COUNTER

Gary H. Kramer 1* and Barry M. Hauck 1

1 Human Monitoring Laboratory, Environmental Radiation Hazards Division, Radiation Protection Bureau, 775 Brookfield Road, PL6302D1, Ottawa, Ontario, K1A 1C1 Canada

* To whom correspondence should be addressed.
Gary H. Kramer, E-mail: gary_h_kramer{at}hc-sc.gc.ca


  Abstract

The Human Monitoring Laboratory has recently completed the graded Z shielding in its lung counting chamber. The addition of a layer of tin and a layer of copper over the existing layer of lead that lined the thick steel walls has improved the background, as confirmed by long counts before and after the shielding was added. The graded Z liner was successful in reducing the general background in the lower energy regions by an average of 16% over the eight regions studied in the range 15-200 keV, over previous values.


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