19–23 Jun 2023
Hofburg Palace & Online
Europe/Vienna timezone

GRANDSim: A Geant4 Based Simulation Software for Detectors in use at CTBTO Radionuclide Particulate Systems

21 Jun 2023, 11:00


Board: 52
E-poster T3.6 Analysis of Radionuclide Monitoring Data Lightning talks: P2.2, P3.2, P3.6


Abdelhakim Gheddou (CTBTO Preparatory Commission)


The CTBTO International Data Centre (IDC) developed a novel Geant4 based Monte Carlo simulation software for HPGe detectors in use at particulate systems of the International Monitoring System (IMS). The software, dubbed GRANDSim (an acronym for Geant4-based RAdioNuclide Detector Simulation tool), allows to simulate both coaxial and planar detectors, and includes default definitions of standard measurement geometries and shielding configurations of the three technologies operated at IMS particulate systems. The software simulates efficiency calibration, isotopic response function and coincidence summing correction factors for any natural and anthropogenic radionuclides of interest. The physical model is automatically optimized by constraining simulation results against experimental calibration for non-summing energies.
Simulated entities are used as support parameters in the automatic processing of daily spectra from IMS for: (a) improving the quality of efficiency calibration (by including coincidence summing corrections), (b) enhancing the nuclide identification results (by including summation peaks) which reduces the workload on analysts in interactive mode, and (c) ensuring reliable activity concentration results by including required coincidence summing corrections when applicable. In addition, GRANDSim simulates gamma spectra for mixtures of radionuclides with any activity concentrations.
The contribution presents the key features of GRANDSim for HPGe detectors in use at particulate systems.

Promotional text

The CTBTO International Data Centre developed a novel open source Monte Carlo simulation software for particulate systems of the International Monitoring System. This poster outlines the key functionalities and main features of the software.

E-mail [email protected]

Primary author

Abdelhakim Gheddou (CTBTO Preparatory Commission)


Mr Martin B. Kalinowski (CTBTO Preparatory Commission) Mr Jonathan Baré (CTBTO Preparatory Commission) Mr Arend Harms (CTBTO Preparatory Commission) Ms Jana Meresova (CTBTO Preparatory Commission) Mr Eric Jilbert Nguelem Mekongtso (CTBTO Preparatory Commission) Ms Carla Maria Salgueiro Pires Winter (CTBTO Preparatory Commission) Mr Jun Wang (CTBTO Preparatory Commission) Mr Seokryung Yoon (CTBTO Preparatory Commission)

Presentation materials