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METHODS TO VERIFY ABSORBED dose OF IRRADIATED ORANGE CONTAINERS AND EVALUATION OF DOSIMETERS

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核农学报 1998年第4期 24-29页

作者： Gao Meixu Wang Chuanyao Tang Zhangxiong Li Shurong(Institute for Application of Atomic Energy, Chinese Academy of Agricultural Sciences, Beijing, 100094)

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关键词： dose distribution dosimeter indicator irradiation

Application of imidacloprid controlled-release granules to enhance the utilization rate and control wheat aphid on winter wheat

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Journal of Integrative Agriculture 2020年第12期19卷 3045-3053页

作者： YUAN Wan-ling XU Bo RAN Gang-chao CHEN Hui-ping ZHAO Peng-yue HUANG Qi-liang Institute of Plant Protection Chinese Academy of Agricultural SciencesBeijing 100193P.R.China Henan Provincial Engineering and Technology Research Center for Controlled Pesticide and Fertilizer Release Henan Haonianjing Biological Development Co.Zhengzhou 450040P.R.China

During winter wheat production, aphids need to be controlled with pesticides for the entire growth period. Controlled-release technology has been regarded as an alternative method for the improvement of pesticide efficiency. This study investigated two types of imidacloprid controlled-release granule (CR-GR): 2% imidacloprid CR-GR and 0.2% imidacloprid pesticide-fertilizer controlled-release granule (PF-CR-GR) when wheat was sown in winter. The release performance, utilization rate, terminal residues in edible parts, control effect on aphids, and achieved winter wheat yield were evaluated for both laboratory experiments and field application. Imidacloprid PF-CR-GR released more quickly in aqueous medium than CR-GR because of its good water solubility. After CR-GR treatments, the concentrations in wheat roots and soil were similar throughout the entire sampling period, and the concentrations in shoots were about 10–20% of those in roots. Imidacloprid was better absorbed when CR-GR was used as root treatment, compared with foliar treatment. Field application showed that imidacloprid CR-GR and PF-CR-GR controlled aphids throughout the entire growth period of winter wheat and improved the wheat yield. These findings identified application of imidacloprid CR-GR and PF-CR-GR on winter wheat as an effective way to enhance the pesticide utilization rate and ensure adequate yield. This paper provides a theoretical basis for the scientific use of pesticides and guides scientific pesticide application.

关键词： controlled-release granule imidacloprid dose distribution control effect wheat

MONTE CARLO CALCULATION OF ENERGY DEPOSITION BY DELTA RAYS AROUND ION TRACKS

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Nuclear Science and Techniques 1994年第3期5卷 138-142页

作者：张纯祥刘小伟罗达玲李冕丰 Zhongshan Univ Guangzhou China

The radial distribution of dose around the path of a hemp ion has been studied by a Monte Carlo transport analysis of the delta rays produced along the track of a heavy ion based on classical binary collision dynamics and a single scattering model for the electron transport process. Result comparisons among this work and semi-empirical expression based delta ray theory of track structure, as well as other Monte Carlo calculations are made for 1, 3 MeV protons and several heavy ions. The results of the Monte Carlo simulations for energetic heavy ions are in agreement with experimental data and with results of different methods. The characteristic of this Monte Carlo calculation is a simulation of the delta rays theory of track structure.

关键词： Track structure dose distribution Monte Carlo simulation

Monte Carlo simulation of carbon ion radiotherapy for the human eye

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Chinese Physics C 2015年第1期39卷 113-116页

作者：庞成果苏有武王文军罗晓明徐俊奎李武元袁娇姚泽恩 School of Nuclear Science and Technology Lanzhou University Institute of Modern Physics Chinese Academy of Sciences Gansu National Health Inspection The People’s Hospital of Linze

Carbon ion is the mostly common used particle in heavy ion radiotherapy. In this paper, the carbon ion dose in tumor treatment for human eye was calculated with FLUKA code. An 80 MeV/u carbon beam was irradiated into the human eye from two directions. The first was from the lateral-forward direction, which was a typical therapeutic condition. In this case, a maximum dose was deposited in the tumor volume. In the second a beam was irradiated into eyes from the forward direction to simulate a patient gazing directly into treatment beam during therapy, which may cause a certain medical accident. This method can be used for a treatment plan in heavy ion radiotherapy.

关键词： carbon ion beam FLUKA dose distribution human eye

Enhancing Precision in Radiotherapy Delivery: Validating Monte Carlo Simulation Models for 6 MV Elekta Synergy Agility LINAC Photon Beam Using Two Models of the GAMOS Code

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World Journal of Nuclear Science and Technology 2024年第2期14卷 146-163页

作者： Nogaye Ndiaye Oumar Ndiaye Papa Macoumba Faye Kodjo Joël Fabrice N’Guessan Djicknack Dione Khady Sy Moussa Hamady Sy Jean Paul Latyr Faye Alassane Traoré Ababacar Sadikhe Ndao Institute of Applied Nuclear Technology University Cheikh Anta Diop Dakar Senegal International Cancer Center of Dakar Dakar Senegal Department of Physics Faculty of Sciences and Technology University Cheikh Anta Diop Dakar Senegal

The most crucial requirement in radiation therapy treatment planning is a fast and accurate treatment planning system that minimizes damage to healthy tissues surrounding cancer cells. The use of Monte Carlo toolkits has become indispensable for research aimed at precisely determining the dose in radiotherapy. Among the numerous algorithms developed in recent years, the GAMOS code, which utilizes the Geant4 toolkit for Monte Carlo simula-tions, incorporates various electromagnetic physics models and multiple scattering models for simulating particle interactions with matter. This makes it a valuable tool for dose calculations in medical applications and throughout the patient’s volume. The aim of this present work aims to vali-date the GAMOS code for the simulation of a 6 MV photon-beam output from the Elekta Synergy Agility linear accelerator. The simulation involves mod-eling the major components of the accelerator head and the interactions of the radiation beam with a homogeneous water phantom and particle information was collected following the modeling of the phase space. This space was po-sitioned under the X and Y jaws, utilizing three electromagnetic physics mod-els of the GAMOS code: Standard, Penelope, and Low-Energy, along with three multiple scattering models: Goudsmit-Saunderson, Urban, and Wentzel-VI. The obtained phase space file was used as a particle source to simulate dose distributions (depth-dose and dose profile) for field sizes of 5 × 5 cm2 and 10 × 10 cm2 at depths of 10 cm and 20 cm in a water phantom, with a source-surface distance (SSD) of 90 cm from the target. We compared the three electromagnetic physics models and the three multiple scattering mod-els of the GAMOS code to experimental results. Validation of our results was performed using the gamma index, with an acceptability criterion of 3% for the dose difference (DD) and 3 mm for the distance-to-agreement (DTA). We achieved agreements of 94% and 96%, respective

关键词： GAMOS Monte Carlo LINAC Radiotherapy dose distribution Phase Space Gamma Index 6 MV Photon Beam