Colloid & Nanoscience Journal

Colloid & Nanoscience Journal

Validation of Geant4 dosimetric model for polyethylene crosslinking in Rhodotron electron beam processing

Articles in Press

Document Type : Original Article

Authors
Shahin Jalilpour 1
Mohammad reza Rezaie 1
Pejman Shirmardi 2
Arezoo Riahi 1
Reza Hafezi Moghaddam 2
1 Department of Nuclear Engineering, Graduate University of Advanced Technology, Kerman, Iran
2 Atomic Energy Organization of Iran (AEOI), Tehran, Iran
10.22034/cnj.2026.2105537.1104
Abstract
High-energy electron-beam irradiation is an effective method for modifying polymer properties, particularly through radiation-induced crosslinking. In this study, a Geant4-based dosimetric model was developed for a 10 MeV Rhodotron electron-beam system and applied to a polyethylene drip-irrigation pipe. The radiation field of the Yazd 200TT Rhodotron was first modeled using MCNP 2.7e and then reproduced in Geant4 11.2.2. The Geant4 framework was independently verified using a 60Co reference source by comparing the simulated and theoretical dose rates at 1 m. The model was subsequently applied to a polyethylene pipe with an outer diameter of 16 mm, a wall thickness of 1.4 mm, and a length of 116 cm at horn-to-pipe distances of 10, 20, 30, and 40 cm. Dose was scored at four circumferential positions and 116 longitudinal segments with 1-cm spatial resolution. After applying a 6.66% correction factor, the single-pass dose coefficients were 76.769675, 74.5640875, 71.074340, and 67.494315 kGy·min⁻¹·mA⁻¹respectively. For a target dose of 150 kGy, selected from published LDPE irradiation results [5], the predicted conveyor speeds at 10 mA were 5.93685, 5.76629, 5.49642, and 5.21956 m/min. The results demonstrate the capability of Geant4 to characterize dose distributions and estimate practical processing conditions for polyethylene pipe irradiation.

Graphical Abstract

Validation of Geant4 dosimetric model for polyethylene crosslinking in Rhodotron electron beam processing
Keywords
Geant4
Electron beam
Polyethylene
Rhodotron
Dosimetry
Crosslinking
Colloid & Nanoscience Journal

Articles in Press, Accepted Manuscript
Available Online from 02 November 2026

  • Receive Date 13 September 2026
  • Revise Date 09 October 2026
  • Accept Date 02 November 2026
  • Publish Date 02 November 2026