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Answer to Question #1111 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: Q
Since the roentgen is a unit which applies to photons in air, when someone uses a GM survey meter to measure a pure beta emitter such as 32P and gets a reading of 2 mR h-1, what do the measurments mean or are they meaningless?
A
The reference response given in the question is not directly applicable to the measurement of beta emitters. This said, such a meter can be calibrated so that a direct conversion can be made from the indicated response (mR h-1) to either a surface beta activity result (Bq cm-2) or to a skin dose rate result (mrad h-1). It should also be noted that calibration factors for beta-emitters will be isotope (energy) specific.
Robert L. Coleman
Oak Ridge National Laboratory
Answer posted on 10 August 2001. The information and material posted on this Web site is intended as general reference information only. Specific facts and circumstances may alter the concepts and applications of materials and information described herein. The information provided is not a substitute for professional advice and should not be relied upon in the absence of such professional advice specific to whatever facts and circumstances are presented in any given situation. Answers are correct at the time they are posted on the Web site. Be advised that over time, some requirements could change, new data could be made available, or Internet links could change. For answers that have been posted for several months or longer, please check the current status of the posted information prior to using the responses for specific applications.
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