Dear Dirk,
I am not sure how well this applies to your particular case but ICRP 98 "Radiation safety aspects of brachytherapy for prostate cancer using permanently implanted sources" seems to consider a 0.5 U seed source equivalent to 14.6 MBq of apparent Activity.
Hope it helps,
Ricardo
//Ricardo dos Santos Augusto
TRIUMF-EH&S
Office: +1 604 222 10 47 (6375)
4004 Wesbrook Mall,
Vancouver, BC V6T 2A3, Canada//
________________________________________
De : Bartkoski,Dirk Alan [DABartkoski_at_mdanderson.org]
Envoyé : samedi 30 mai 2020 20:33
À : Ricardo Manuel Dos Santos Augusto
Cc : fluka-discuss_at_fluka.org
Objet : Re: [EXT] RE:Dose from Activity Units
Thank you for the response. It is very helpful. Upon further investigation, you are correct, it is indeed 0.5 U as uGy m^2/h, not amu.
However, now I am unsure how to convert my FLUKA output from Gy/decay to Gy/s based on the source strength. Any direction would be greatly appreciated.
In regard to semi-analogue mode for single chain decay, thanks forever pointing this out. This is my foray into radioactive source implementation and I had not considered the use of TIME-CUT.
_______________________________________________________________________________
Dirk A. Bartkoski, Ph.D.
Computational Scientist | Division of Radiation Oncology
T. Boone Pickens Tower (FCT8.5007)
1515 Holcombe Blvd.
Unit 1420
Houston, TX 77030
(713)794-5026<tel:(713)794-5026>
On May 30, 2020, at 3:07 AM, Ricardo Manuel Dos Santos Augusto <r.s.augusto_at_cern.ch> wrote:
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Dear Dirk,
The approach is correct*, but are you sure about the 0.5 u? in some cases U is used to indicate the source strength.
*Note that your conversion to dose, in your particular case, is valid because you have a single isotope in the chain. Since semi-analogue mode you get all the decay products if you had additional isotopes in the decay chain (e.g. a very short lived and a long lived for instance) the dose rate calculation would be meaningless. In such cases, it is often preferrable to employ a TIME-CUT to restrict the scoring to the parent isotope (age=0) by discarding the daughters' contribution (age according to their respective half-life).
Kind regards,
Ricardo
//Ricardo dos Santos Augusto
TRIUMF-EH&S
Office: +1 604 222 10 47 (6375)
4004 Wesbrook Mall,
Vancouver, BC V6T 2A3, Canada//
________________________________
De : owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] de la part de Bartkoski,Dirk Alan [DABartkoski_at_mdanderson.org]
Envoyé : mercredi 27 mai 2020 16:53
À : 'fluka-discuss_at_fluka.org'
Objet : [fluka-discuss]: Dose from Activity Units
I just want to verify that I am properly converting the units of my results.
I have a 0.5 u radioactive Iodine 125 source that is defined as an ISOTOPE in the BEAM card.
I am using Semi-Analogue in the RADDECAY card and have applied Semi-Analogue to my USRBINs with DCYSCORE.
I want to measure dose to volume from my radioactive source. I have defined the desired volume using USRBIN for DOSE.
From what I understand, my USRBIN with be in GeV/g/decay since I am scoring DOSE from a radioactive isotope.
I want dose rate.
GeV/g/decay*1.602176462E-7 = Gy/decay
Iodine 125 specific activity = 642E12 Bq/g => 642E12 decay/s/g
To get dose rate in Gy/s => (USRBIN value in GeV/g/decay)* 1.602176462E-7*642E12 decay/s/g*0.5*(flair atomic mass unit to gram conversion constant amugr)
My conversion constant is = 1.602176462E-7*642E12*0.5*amugr => Gy/s
Is my approach correct?
_______________________________________________________________________________
Dirk A. Bartkoski, Ph.D.
Research Scientist | Division of Radiation Oncology
<image001.jpg>
T. Boone Pickens Tower (FCT8.5007)
1515 Holcombe Blvd.
Unit 1420
Houston, TX 77030
(713)794-5026
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Received on Sat May 30 2020 - 22:36:33 CEST