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Answer to Question #1832 Submitted to "Ask the Experts"Category: Doses and Dose Calculations — Basic dose information, dose quantities, units The following question was answered by an expert in the appropriate field: Q
I'm trying to develop/calculate an analogy to compare exposure received from an x ray (say 300 mrem) to exposure rate imparted to a NORM worker.
Are the following calculations correct?
X ray exposure/time = 300 mrem/.04 sec = 7,500,000 microR.
For a NORM Worker to receive that exposure he would need to be exposed to a rate of:
7,500,000 microR/2,080 hr = 3,605 microR/hr. . . .
where 52 weeks/yr x 40 hrs/wk = 2,080 hrs
A
There are some problems with your calculations. Based on the information given I say:
The total effective dose (ED) from the procedure is 300 mrem, independent of delivery time (perhaps a GI series). The constant effective dose rate to be received by a NORM worker to equal this ED would be simply:
300 mrem/2,080 h = 0.14 mrem/hour.
John Lowe
Answer posted on 27 April 2002. 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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