Abstract
The aim of the present study is to evaluate a gamma probe with active shielding by using GEANT4 simulation framework. We used BGO scintillators both for gamma detection and active shielding from a point radioactive source, namely 140 keV gammas from \(^{99m}\hbox {Tc}\). All scintillators were coupled to the silicon photomultipliers with an active area of \(3\times 3\) \(\hbox {mm}^{2}\). The response of the gamma probe to radiation was simulated using the optical photon transportation available in the GEANT4 package. We used the simulation results to determine the sensitivity, spatial and angular resolution, and shielding efficiencies in the air and scattering medium for the proposed gamma probe model according to NEMA NU 3-2004 standards. The ability of the probe to find the direction of emission was also evaluated. The sensitivity of the probe was found between 1262 - 42284 cps/MBq in the scattering medium based on two scenarios based on active shielding use. In terms of FWHM, the spatial resolution in scattering medium at 30 mm source-to-probe distance was 31 mm and the angular resolution at the same distance was \(59^{\circ }\). The shielding effectiveness of the probe was in the range of 89.90 ± \(0.65\%\) and 97.20 ± \(0.19\%\). The emission directions of gammas were found with an error of less than 8°.
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Access to the data presented in this paper can be provided and for this and any further inquiries about our work please contact the authors. This manuscript has associated data in a data repository. [Authors’ comment: The datasets used in this study are available from the corresponding author upon reasonable request.]
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Acknowledgements
This study was supported by the Scientific and Technological Research Council of Turkey (TUBITAK Project No: 121F291).
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Simulations and analysis were performed by OBK, TY and EI The draft of the manuscript was written by OBK and all authors commented on previous versions of the manuscript.
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Kolcu, O.B., Yetkin, T. & Iren, E. Development of active shielding gamma probe: a simulation study. Eur. Phys. J. Plus 138, 169 (2023). https://doi.org/10.1140/epjp/s13360-023-03792-x
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DOI: https://doi.org/10.1140/epjp/s13360-023-03792-x