A new look of spectra and ROI
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GeoFreelancer
- Posts: 14
- Joined: 15 Mar 2026, 22:27
A new look of spectra and ROI
OpenGammaSpec (v08.3.3.1) has a number of new capabilities. I have described some (but not all) in the attached article. Furthermore, this is just the beginning of new expansions.
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ColoRad-o
- Posts: 62
- Joined: 18 Oct 2019, 08:27
Re: A new look of spectra and ROI
GeoFreelancer--Sorry if I've missed earlier posts. Is the purpose of OpenGammaSpec to permit high-reliability analysis of spectra? Where does the efficiency curve come from [Fig 8]? GEANT4-like simulations, GADRAS, or something like that? Does this not depend on the detector GEOMETRY? Presumably the CORRECTED curve (q_rg2_corr) mutliplied by the gamma energy is related to the raw dose rate from the sample--is this what is shown in Fig. 10?
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GeoFreelancer
- Posts: 14
- Joined: 15 Mar 2026, 22:27
Re: A new look of spectra and ROI
Hello David,
Many thanks for your response.
Regarding the efficiency curve: This refers to the detector efficiency, not to the geometric efficiency (which is calculated separately), so it does not depend on the geometry of the setup, but it is calculated for the specific detector shape.
As a geologist, I always prefer to measure rather than simulate. I work with a 2 inch CeBr3 detector with an MCA from BrightSpec. The manufacturer does not provide an efficiency curve for the detector. My program (OpenGammaSpec) has a module for calculating detector efficiency, which is described in the documentation of OpenGammaSpec on SourceForge.net (Determining_the_Detector_Efficiency.pdf) . As a retired geologist, I don't have access to artificial radionuclide, so I had to use what I had, and uranocicite was a good choice.
Figure 10 refers to the corrected raw dose rate, so you still have to divide it by the live time and take the geometric efficiency into account.
If you have detailed questions, please feel free to write to me at IMDP@gmx.de.
Best regards
Christian
Many thanks for your response.
Regarding the efficiency curve: This refers to the detector efficiency, not to the geometric efficiency (which is calculated separately), so it does not depend on the geometry of the setup, but it is calculated for the specific detector shape.
As a geologist, I always prefer to measure rather than simulate. I work with a 2 inch CeBr3 detector with an MCA from BrightSpec. The manufacturer does not provide an efficiency curve for the detector. My program (OpenGammaSpec) has a module for calculating detector efficiency, which is described in the documentation of OpenGammaSpec on SourceForge.net (Determining_the_Detector_Efficiency.pdf) . As a retired geologist, I don't have access to artificial radionuclide, so I had to use what I had, and uranocicite was a good choice.
Figure 10 refers to the corrected raw dose rate, so you still have to divide it by the live time and take the geometric efficiency into account.
If you have detailed questions, please feel free to write to me at IMDP@gmx.de.
Best regards
Christian
