Метод расчета поглощенной (эквивалентной) дозы и мощности поглощенной (эквивалентной) дозы ионизирующего излучения

Abstract

В статье предложен метод расчета поглощенной (эквивалентной) дозы и мощности поглощенной (эквивалентной) дозы ионизирующего излучения (гамма-, нейтронное и электронное излучение) в точке. Предложены аппроксимирующие функции и рассчитаны соответствующие коэффициенты. Приведены графики зависимостей коэффициентов перевода флюенса частиц и флюенса энергии частиц в поглощенную (эквивалентную) дозу в зависимости от энергии частиц.One of the perspective way to calculate absorbed (equivalent) dose and their rate is numerical simulation. GEANT4 is one of the software toolkit for the simulation of the passage of particles through matter.The article is devoted to define correct way of dose and dose rate calculation as dose rate should be calculated at the point; correct way of dose conversion coefficient approximation by piecwise continuous function. Calculation method of the absorbed (equivalent) dose and absorbed (equivalent) dose rate of ionizing radiation (gamma, neutron andelectron radiation) at the point is proposed in the article. Approximating functions are proposed and the corresponding coefficients are calculated. Figures with coefficients dependencies of particles fluence and particle fluence energy depending on the energy of the particles are given. These coefficients are needed for calculations of absorbed (equivalent) dose. The absorbed dose rate calculation method which is used in GEANT4 can not beused for dose rate calculation. Proper mathematical method for absorbed dose rate calculation was chosen and was described in the article. Also, the method of absorbed (equivalent) dose rate calculation are given. Proposed calculation method of the absorbed (equivalent) dose and absorbed (equivalent) dose rate of the ionizing radiation may be used for numerical simulation of ionization radiation passage through the matter, for example, with the use of GEANT4.