本文利用蒙特卡罗软件TOPAS模拟200MeV质子在石墨、铍和碳化硼三种不同材料多楔形结构降能器中的输运过程，统计了穿过降能器后质子以及产生的次级中子的能量通量，并计算了质子束流在穿过不同降能器后的能量分散，据此得到了三种材料降能器厚度与质子能量之间的关系曲线，同时也分析了不同降能器对质子束传输效率的影响以及次级中子产额的情况。通过对比发现，三种材料降能器对束流的能量发散效果相当，而使用铍或者碳化硼都能提高束流传输效率，尤其铍降能器的性能较优。但铍和碳化硼与质子相互作用会产生更多的次级中子，因此在实际应用时需要更多地考虑次级中子对设备的辐射防护。
", "ds_source": "本文利用蒙特卡罗软件TOPAS模拟200MeV质子在石墨、铍和碳化硼三种不同材料多楔形结构降能器中的输运过程，统计了穿过降能器后质子以及产生的次级中子的能量通量，并计算了质子束流在穿过不同降能器后的能量分散，计算出不同材料降能器厚度与质子能量之间的关系曲线，同时也分析了不同降能器对质子束传输效率的影响以及次级中子产额的情况
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", "ds_acq_start_time": "2017-01-01 00:00:00", "ds_acq_end_time": "2019-12-31 00:00:00", "ds_acq_place": "甘肃兰州", "ds_acq_lon_east": null, "ds_acq_lat_south": null, "ds_acq_lon_west": null, "ds_acq_lat_north": null, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "apply-access", "ds_total_size": 8120054, "ds_files_count": 2, "ds_format": "pdf", "ds_space_res": null, "ds_time_res": "", "ds_coordinate": "无", "ds_projection": "", "ds_thumbnail": "6d9b22da-0817-470b-addf-3e880c2b98ec.png", "ds_thumb_from": 0, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "9971252d-7beb-4464-bc08-bdcc5a1d7dd1", "ds_serv_man": "敏玉芳", "ds_serv_phone": "0931-4967596", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": [], "quality_level": 3, "publish_time": "2023-11-27 10:23:26", "last_updated": "2023-11-27 10:23:26", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.NCDC.IMP.DB4088.2023", "i18n": { "en": { "title": "Monte Carlo simulation of the radiotherapy properties of 200 MeV proton by several different material energy deminerators", "ds_format": "", "ds_source": "In this paper, the Monte Carlo software Topas is used to simulate the transport process of 200 MeV protons in multi wedge structure energy reducers made of graphite, beryllium and boron carbide. The energy fluxes of protons and secondary neutrons after passing through the energy reducers are calculated, and the energy dispersion of proton beam after passing through different energy reducers is calculated, At the same time, the influence of different energy reducers on the proton beam transmission efficiency and the secondary neutron yield are analyzed
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", "ds_ref_way": "", "ds_abstract": "In this paper, the Monte Carlo software Topas is used to simulate the transport process of 200 MeV protons in multi wedge structure energy reducers made of graphite, beryllium and boron carbide. The energy fluxes of protons and secondary neutrons after passing through the energy reducers are calculated, and the energy dispersion of proton beam after passing through different energy reducers is calculated, Based on this, the relationship between the thickness of three kinds of energy reducers and the proton energy is obtained. The influence of different energy reducers on the proton beam transmission efficiency and the secondary neutron yield are also analyzed. By comparison, it is found that the three kinds of energy reducers have the same effect on the beam energy divergence, and the use of beryllium or boron carbide can improve the beam transmission efficiency, especially the performance of beryllium energy reducers is better. However, the interaction of beryllium and boron carbide with protons will produce more secondary neutrons, so more attention should be paid to the radiation protection of secondary neutrons in practical applications.
", "ds_time_res": "", "ds_acq_place": "Lanzhou, Gansu", "ds_space_res": "", "ds_projection": "", "ds_process_way": "Processing with Monte Carlo software
", "ds_ref_instruction": "" } }, "submit_center_id": "ncdc", "data_level": 0, "recommendation_value": 0, "license_type": "https://creativecommons.org/licenses/by/4.0/", "doi_reg_from": "reg_local", "cstr_reg_from": "reg_local", "doi_not_reg_reason": null, "cstr_not_reg_reason": null, "is_paper_in_submitting": false, "belong_to_nieer": false, "ds_topic_tags": [ "质子放疗", "将能器", "蒙特卡洛", "TOPAS", "传输效率" ], "ds_subject_tags": [], "ds_class_tags": [], "ds_locus_tags": [ "安徽", "合肥" ], "ds_time_tags": [ 2017 ], "ds_contributors": [ { "true_name": "肖国青", "email": "xiaogq@impcas.ac.cn", "work_for": "中国科学院近代物理研究所", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "肖国青", "email": "xiaogq@impcas.ac.cn", "work_for": "中国科学院近代物理研究所", "country": "中国" } ], "ds_managers": [ { "true_name": "肖国青", "email": "xiaogq@impcas.ac.cn", "work_for": "中国科学院近代物理研究所", "country": "中国" } ], "category": "其他" }