I have a source: Co-60 and measure a dose equivalent equal 31.73 x 10^-6 Sievert (by FDM 1000 detection) ( distance from resource to detection equal 1cm, time= 45 minutes). Can i calculate the radiation activity?.
Thank you very much.
Hi;
You can use radprocalculator.
http://www.radprocalculator.com/
You should follow on the site;
online calculators/ dose rate/ gamma activity to dose rate
Regards.
It is likely that FDM 1000 from Samyoung Unitech (Korea) is the energy compensated Guiger-Müller tube with integrated dose range from 0.01 µSv to 10 Sv. In your measurement, the dose you measured (31.73 µSv in 45 minutes) is in this range, but the source to detector/chamber distance (SDD/SCD) is 1 cm. So, simple conversion from the dose you measured to radioactivity of the source may not apply depending on the size and shape of the source.
Mr Nobuyuki Hamada and Mr.Nobuyuki Hamada. Many thanks for your information
I used radprocalculator but the calculated value smaller than specification of source (Co-60 has radiation activity equals 10 -6 Ci, calculated value = 4.04 x 10-9 Ci) .
Please explain details how to calculate radiation activity? ( I use FDM 1000 from Samyoung Unitech (Korea)) . Thank you so much.
You mentioned that the radioactivity of the source is 1 µCi (= 37 kBq), but 60Co decays with the physical half-life of 5.27 years. Was 1 µCi its radioactivity when you had a measurement that yielded 31.73 µSv?
In general, most of the measurement devices are "calibrated" for 137Cs. Does the device has a preset for 60Co and did you used it for the measurement?
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