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Answer to Question #4981 Submitted to "Ask the Experts"Category: Radiation Basics — Photons The following question was answered by an expert in the appropriate field: Q
I have some five-gallon cans that contain oil with a small amount of 56Co (846 keV gamma) suspended in it. Because the total activity is low (<1 µCi), measuring the activity contained in the can is easier if I place my pancake probe close to the whole can rather than measuring a small sample from the can. Unfortunately, a can doesn't look much like a point source, and this makes the geometric factors needed to calculate activity complex. Is there an accepted formula for cylindrical containers (such as barrels) to back-calculate activity? Is there a standard protocol for where the measurements are done—on the side at the midpoint of the oil level? Above the top of the can? Both?
A
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Answer posted on 17 November 2005. 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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