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Radiation Protection Dosimetry Advance Access originally published online on January 6, 2005
Radiation Protection Dosimetry 2005 113(2):211-213; doi:10.1093/rpd/nch442
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Scientific Note

Evaluation of the new graded Z liner in the Human Monitoring Laboratory's lung counter

Gary H. Kramer* and Barry M. Hauck

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

* Corresponding author: gary_h_kramer{at}hc-sc.gc.ca

Received June 3, 2004, amended November 29, 2004, accepted December 5, 2004

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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