Hi,
I wanted to ask for confirmation. when I get a dose value from usrbin in a region, the value is normalized by region and primary, so I have to divide it by the area and material density of the region, right? And then if I am considering a source of a certain radionuclide, the primaries are the activity in Bq per seconds, and should I multiply this value with the one obtained?
thanks in advance
Dear Andrea,
In the case of a USRBIN scoring with the type Region, the results must be divided by the region’s volume to get the expected units.
When using a radioactive source with a semi-analogue option, a primary would be a single decay (plus all the daughters in equilibrium), so the results needs to be multiplied by the activity of the original isotope.
Cheers,
David
Thanks for the reply.
So if I am simulating a decaying radionuclide, the dose I obtain in the region must be divided by the volume of the region itself and multiplied by the original activity. Doesn’t the density of the region have an impact? And then if I wanted to obtain a measurement in Gy/(h*Bq) from the FLUKA dose result, then I would have to divide the result by the volume, multiply it by 1.6e-7 so as to pass into Gray and finally multiply by 3600 to obtain a dose over time, right?
Dear Andrea,
For dose FLUKA scores the deposited energy in the region divided by the density, which gives [GeV*cm3/g/primary], thus you need to divied by the volume of the region (Note: If you are using the standard USRBIN scoring with a binning, the division is done automatically).
If you done the division by the volume and multiplied the results with 1.602176462E-7, then you get [Gy/primary] = [Gy/decay]. You need to multiply this with the actual activity of the source [Bq] = [decay/s] to get [Gy/s] multiplying this with 3600 gives [Gy/h].
Cheers,
David
Perfect thank you very much. One last question, if I wanted to obtain Gy/(h*Bq), what conversion factor should I use?
Hi Andrea,
maybe I’m missing something, but [Gy/h/Bq] is just a conversion factor between the dose and activity (for a specific source/geometry, etc…), obtainable with a simple division.
But if you expand the unit, you simply get [Gy/3600 decays].
Cheers,
David
Yes, what I would like to do is verify some values ​​declared in ICRP 107 with FLUKA. So I would like to understand how to arrive at a value in Gy(h*Bq).
Dear Andrea,
you need to multuply the FLUKA results [GeV/g] with 1.602176462E-7 and 3600 to get [Gy/h/Bq].
Cheers,
David
Ok, if instead I am trying to find the dose emitted by a semi-analogue Con Iodine source, how can I measure only the dose emitted by the decay of iodine into Xenon without also considering the decay of Xenon.
Hi Andrea,
see this post:
Cheers,
David