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18 March 2010

Answer to Question #204 Submitted to "Ask the Experts"

Category: Instrumentation and Measurements — Surveys and Measurements (SM)

The following question was answered by an expert in the appropriate field:

Please forward information on very high-range dose-rate and dose detectors (>100 Krad). Thanks.

TLD (LiF and LiBO) will normally reach supralinearity around 1,000 rad. This is due to the PM Tube and its characteristics. In order to measure response above 1,000 rad, various filters need to be used that protect the PM tube, as well as obtaining a good TL output glow curve. ICN uses a 1,000X filter to measure dose up to 10^6 rad (actual dose may be higher based on appropriate calibrations). Facilities that require these measurements include sterilization facilities (industrial and medical research) and power reactors where TLDs are placed in the core to measure potential embrittlement. You can visit our ICN Worldwide Dosimetry Web site for more information. Or you may contact me (Sander Perle) at ICN Dosimetry. Editor's Note: Other companies might have similar information. To contact some you can go to the HPS Web site's Affiliates page.

Gen Roessler,
Editor Health Physics Society Web Site

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