CZT Detector Weighted Integration Method For Measuring Ambient Dose Equivalent

Ambient dose equivalent is a operational quantities of radiation protection field monitoring, for the evaluation of radiation effective dose to the human body. General detection instruments with different material of the ICRU ball, and ICRU ball was used definition the ambient dose equivalent. Energy response can not meet the measurement requirements. Most detectors used measurements of other, such as Kerma, exposure, dose, and so on, through the conversion factor calculated ambient dose equivalent. The issue is weighted integration method for direct measurement by a new type of semiconductor detector CdZnTe pulse.The weighted integration method amend detector energy response of for a long time, there was a lot of applications in the field of radiation monitoring. The core of the content is the calculation of G(E) function, G(E) function calculation method is iterative method and the least square method.The principle of the least squares method is to set the basic form of G(E) function; standard sources generate dose corresponds to the spectrum by the detector, calculated G(E) function coefficients by the least square method, and achieve G(E) function.A series of CdZnTe detectorγ-ray single energy spectrum is indispensable to calculate G(E) function. We get detectorγenergy spectrum with simulation methods because limited experimental conditions. Calculated photon energy deposition size and location in the detector with Monte Carlo program MCNP, then account the charge of the collection by photon inspire. On this basis, we taking into account the charge collection efficiency, Fano factor and the impact of electronic noise, using MATLAB software to calculated single-energy photon response spectrum in the CdZnTe detectors.To test our methods in the laboratory, we get the dose with weighted integration method to dealing experimental measurement spectrum and get theoretical value of ambient dose equivalent by theoretical calculation. In the contrast and analysis, we proved that the G(E) function weighted integral Method for the determination of ambient dose equivalent is feasible, to lay the foundation for the next step to development ambient dose equivalent monitor.