Full 3D position reconstruction of a radioactive source based on a novel hyperbolic geometrical algorithm

Area of Science:

• Nuclear Physics and Instrumentation
• Medical Imaging and Radiation Detection

Background:

• Accurate localization of gamma-ray sources is crucial for various scientific and industrial applications.
• Existing methods may lack the precision required for complex scenarios involving multiple gamma-ray emissions.

Purpose of the Study:

• To develop and validate a new method for high-precision 3D localization of gamma-ray sources.
• To assess the performance of the developed method using conventional scintillation detectors and a novel reconstruction algorithm.

Main Methods:

• Employed a symmetrical array of 16 lanthanum bromide (LaBr3(Ce)) scintillation detectors.
• Utilized detector energy and time signals from gamma-ray interactions.
• Developed and applied a new source position reconstruction algorithm, validated with Geant4 Monte Carlo simulations of a Cobalt-60 source.

Main Results:

• Achieved millimeter-level localization accuracy for a gamma-ray source at the origin (-0.3 ± 2.5 mm, -0.4 ± 2.4 mm, -0.6 ± 2.5 mm).
• Demonstrated high precision for an off-center source (20.2 ± 1.0 mm, 20.2 ± 0.9 mm, 20.1 ± 1.2 mm).
• The developed algorithm shows robust performance across different source positions.

Conclusions:

• The new method provides precise 3D localization of gamma-ray sources with millimeter uncertainty.
• Potential applications include nuclear medicine, national security, radioactive waste assay, and proton beam therapy.
• This technique represents a significant advancement in radiation detection and source localization.