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Please note workers who are pregnant or trying to conceive must consult with the Radiation Safety Officer prior to working with radiation, to ensure exposure remains below the public effective dose limit (1 mSv/year).
An estimation of the total annual effective external dose can be made using data sheets available in an extract from the Radionuclide and Radiation Protection Data Handbook (2002) . The values provided in the ‘External Exposure’ section of the data sheets cover several exposure routes, and by adjusting for the estimated contact hours and the source size, an approximate annual dose can be calculated.
Example of dose estimation - exposure to a 37MBq Co-57 source for 25 hours.
Calculation: (2.52 x 10-4) x 37 x 25 = 0.2331mSv
Please refer to data sheet here
When estimating a dose the worst-case should be assumed (ie. choose high values). If your estimated dose exceeds the limit listed above please contact the Radiation Safety Officer.