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Updated: Oct 22, 2025
10:24
Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
Published on: May 7, 2021
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Neutron contamination in radiotherapy processes: a review study.
Nooshin Banaee1, Kiarash Goodarzi2, Hassan Ali Nedaie3
1Medical Radiation Research Center, Central Tehran Branch, Islamic Azad University, Tehran 1469669191, Iran.
Journal of Radiation Research
|September 1, 2021
Summary
High-energy photon beams in radiotherapy can cause neutron contamination from interactions with LINAC materials. This neutron contamination impacts shielding, patient dose, and secondary cancer risk, requiring careful consideration in treatment planning.
Area of Science:
- Medical Physics
- Radiation Oncology
- Nuclear Engineering
Background:
- High-energy photon beams are essential for deep-seated tumor radiotherapy.
- Neutron contamination arises from photoneutron interactions (>8 MeV) with high Z materials in linear accelerators (LINACs).
- This contamination poses significant challenges, including inaccurate shielding calculations, increased patient dose, and elevated risks of secondary cancers.
Purpose of the Study:
- To review parameters influencing neutron production during radiotherapy.
- To highlight the critical issue of neutron contamination in high-energy photon beam therapy.
- To inform strategies for mitigating risks associated with neutron-induced radiation.
Main Methods:
- Literature review of photoneutron interactions in radiotherapy settings.
- Analysis of factors affecting neutron yield and energy spectra.
- Examination of the impact of neutron contamination on treatment planning and safety.
Main Results:
- Neutron production is dependent on photon beam energy and LINAC material composition.
- Shielding requirements are significantly influenced by the quantity and energy of photoneutrons.
- Patient dosimetry and secondary cancer risk assessment are directly affected by neutron contamination.
Conclusions:
- Understanding neutron production parameters is crucial for safe and effective radiotherapy.
- Mitigation strategies for neutron contamination are necessary to optimize patient outcomes.
- Further research into advanced shielding and treatment planning is warranted.
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