Method of measuring absorbed dose of radiation in small irradiation fields

A method of measuring an absorbed dose of radiation in small irradiation fields, comprising:

• acquiring absorbed dose distribution data of radiation;
• determining a region where an absorbed dose of radiation of a predetermined ratio or more is absorbed based on the absorbed dose distribution data of radiation;
• forming a scintillator having a shape in which a plurality of hexahedral cells are coupled to have a shape matching the region;
• measuring an absorbed dose of radiation irradiating the scintillator from a radiation irradiation device;
• and
• calculating the absorbed dose of radiation of the cell at a predetermined position by using Equations 1 to 4,
• δ
• i
• ,
• j
• ,
• k
• =
• D
• ⁡
• (
• i
• ,
• j
• ,
• k
• )
• D
• ⁡
• (
• a
• ,
• b
• ,
• c
• )
• [
• Equation
• ⁢
• 1
• ]
• (D(a,b,c) is an absorbed dose of radiation of the cell located at the a-th in the x-axis direction, the b-th in the y-axis direction, and the c-th in the z-axis direction on the three-dimensional coordinate system based on the cell located at a predetermined position of the scintillator, and D(i,j,k) is an absorbed dose of radiation of the cell located at the i-th in the x-axis direction, the j-th in the y-axis direction, and the k-th in the z-axis direction on the three-dimensional coordinate system based on the cell located at a predetermined position of the scintillator)
• k
• v
• =
• [
• Vcell
• ∑
• i
• ,
• j
• ,
• k
• δ
• i
• ,
• j
• ,
• k
• ]
• [
• Equation
• ⁢
• 2
• ]
• (Kv is the volume average correction factor, Vcell is the volume of the scintillator, and
• ∑
• i
• ,
• j
• ,
• k
• δ
• ⁡
• (
• i
• ,
• j
• ,
• k
• )
• is the information included in the absorbed dose distribution data of radiation)
• Dm
• =
• Dd
• Vcell
• [
• Equation
• ⁢
• 3
• ]
• (Dm is the average absorbed dose of radiation measured by the scintillator, Dd is the total absorbed dose of radiation measured by the scintillator, and Vcell is the volume of the scintillator)
• D(a,b,c)=Kr*Dm [Equation 4]
• (D(a,b,c) is the absorbed dose of radiation of the cell located at the a-th in the x-axis direction, the b-th in the y-axis direction, and the c-th in the z-axis direction on the three-dimensional coordinate system based on the cell located at a predetermined position of the scintillator, Kv is the volume average correction factor, and Dm is the average absorbed dose of radiation measured by the scintillator).