Answer to Question #2779 Submitted to "Ask the Experts"
The following question was answered by an expert in the appropriate field:
What is the formula to convert sievert to rem? I need to do the conversion as my electronic pocket dosimeter gives the reading as sieverts but I need to report in rem (or mSv or microSv to mrem).
The sievert (Sv) is the System International or SI unit for dose equivalent (H). The rem is the same, but is an older conventional unit still used at an operational level here in the United States. To address your question, 1 Sv = 100 rem.
When converting units be careful of the "prefix" or "symbol" on the unit, i.e., "M" for mega, "m" for "milli," "μ" for "micro," etc. A prefix, or its symbol, connotes a certain order of magnitude with the numerical value shown. For example, milli implies one thousandth, thus, 1 mSv = 0.001 Sv, and micro one millionth, 1 μSv = 0.000001 Sv. This is a convenient way to state a smaller value of a measurement quantity without having to write out a lot of zeroes, and it can be applied to any unit, e.g., μCi for microcurie, mL for milliliter, etc.
For further reading, I would recommend the annual buyers guide supplement to the journal Physics Today. This always has the recommended values for basic physical constants and a guide to metric practice. You might also look at a Frequently Asked Question on Dose Units on our website.
David J. Allard, CHP
Answer posted on 12 August 2003. The information and material posted on this website 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 Website. 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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