研究目的
To analyze if LinAcs possessing Beryllium components in its treatment head structure produce neutron pollution when using low-energy treatment beams (6 MeV) and to ensure that this unwanted radiation can be considered negligible.
研究成果
The study demonstrated that LinAcs containing a Beryllium filter generate photoneutrons even when using low-energy treatment beams (6 MeV). However, the neutron dose received by the patient is insignificant and does not necessitate alterations in radiation protection measures for treatments using such LinAcs.
研究不足
The study is limited to the specific configuration of the Varian TrueBeam LinAc with a Beryllium filter and a 6 MeV treatment beam. The results may not be directly applicable to other LinAc models or higher energy beams.
1：Experimental Design and Method Selection:
Monte Carlo simulation code MCNP6.1.1 was used to simulate the generation of photoneutrons in a Varian TrueBeam LinAc with a 6 MeV beam. The use of unstructured mesh geometries was a novelty in this version, offering more reliable results and higher speed computation.
2：1 was used to simulate the generation of photoneutrons in a Varian TrueBeam LinAc with a 6 MeV beam. The use of unstructured mesh geometries was a novelty in this version, offering more reliable results and higher speed computation.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The study focused on the Varian TrueBeam LinAc located in the Hospital Universitari I Politècnic la Fe (Valencia, Spain), which includes a Beryllium window at the exit of the first collimator.
3：List of Experimental Equipment and Materials:
The LinAc model was created using 3D Modeling Software for Engineering ANSYS SpaceClaim and meshed with Abaqus/CAE. The simulation used the MCNP6.1.1 code.
4：1 code.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The simulation included the transport of the 6 MeV beam particles through the treatment head, with variance reduction methods applied. The photoneutron generation was studied for three different field sizes configurations.
5：Data Analysis Methods:
The results were displayed through PARAVIEW software, and the neutron fluence and dose distribution were analyzed.
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