Determination of the conventional true value of gamma-ray air kerma in a minitype reference radiation

Liu, Yixin; Wei, Biao; Zhuo, Renhong; Wen, Dezhi; Ding, Da-Jie; Xu, Yangguang; Benjiang, Mao

doi:10.1016/j.apradiso.2016.09.018

Cited by 13 publications

(13 citation statements)

References 15 publications

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“…Through a previous study, a CAK measuring method in the MRR was invented and the related patents were issued in China and the U.S.A. [11,12]. In the study, we verified the feasibility of the invented method for determining the CAK at the point of test in the MRR and achieved a determination of uncertainty less than 4.65% [7]. With the support of the invented method, an in-situ calibration device for portable gamma dosimeters based on the MRR was developed.…”

Section: Introductionmentioning

confidence: 67%

“…To solve the above problem, the China Academy of Engineering Physics (CAEP) proposed the idea of constructing a minitype reference radiation (MRR) for the in-situ calibration of portable gamma ray dosimeters [7,8]. In a previous study, Li [9] and Xu [10] conducted research on Monte Carlo simulations of the MRR, which provided theoretical and technical support for better understanding the MRR.…”

Section: Introductionmentioning

confidence: 99%

“…In a previous study, Li [9] and Xu [10] conducted research on Monte Carlo simulations of the MRR, which provided theoretical and technical support for better understanding the MRR. The author of this article conducted physical experimental studies on the MRR with 0.5 m × 0.5 m × 0.5 m and 1 m × 1 m × 1 m dimensions [7,8]. With a drastic reduction in the dimensions compared to the SRR, the scattering gamma rays from the internal surface of the shielding box and probe will disturb the radiation in the MRR.…”

Section: Introductionmentioning

confidence: 99%

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An in-situ calibration device for portable gamma dosimeters based on minitype reference radiation

et al. 2019

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This paper reports an in-situ calibration device for portable gamma dosimeters based on the minitype reference radiation (MRR). Compared to the standard reference radiation (SRR) regulated by the ISO-4037 series standards for gamma dosimeter calibration purposes, the dimensions of the MRR of the device were drastically reduced to 0.6 m × 0.6 m × 0.6 m, and the total weight of the device was approximately 800 kg. According to the test experiments, the device met the radiation protection requirements, and the air kerma rate range covered 1 µGy/h-10 mGy/h, which is appropriate for calibrating protection level gamma dosimeters. A series of dosimeters were calibrated in the SRR and the device, and the mean deviation of the calibration factors was approximately 5.66%. K: Dosimetry concepts and apparatus; Radiation damage monitoring systems 1Corresponding author.

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Section: Introductionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An in-situ calibration device for portable gamma dosimeters based on minitype reference radiation

et al. 2019

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“…According to the findings of this study, air tension falls as tube voltage rises and exposure falls. Air kerma has been measured and reported on by researchers in the medical and industrial sectors [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. These analyses did not include the rest of the X-ray tube’s radiation field in their estimation of air kerma at the tube’s core.…”

Section: Introductionmentioning

confidence: 99%

Air Kerma Calculation in Diagnostic Medical Imaging Devices Using Group Method of Data Handling Network

Zhang

Wang

et al. 2023

Diagnostics

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The air kerma, which is the amount of energy given off by a radioactive substance, is essential for medical specialists who use radiation to diagnose cancer problems. The amount of energy that a photon has when it hits something can be described as the air kerma (the amount of energy that was deposited in the air when the photon passed through it). Radiation beam intensity is represented by this value. Hospital X-ray equipment has to account for the heel effect, which means that the borders of the picture obtain a lesser radiation dosage than the center, and that air kerma is not symmetrical. The voltage of the X-ray machine can also affect the uniformity of the radiation. This work presents a model-based approach to predict air kerma at various locations inside the radiation field of medical imaging instruments, making use of just a small number of measurements. Group Method of Data Handling (GMDH) neural networks are suggested for this purpose. Firstly, a medical X-ray tube was modeled using Monte Carlo N Particle (MCNP) code simulation algorithm. X-ray tubes and detectors make up medical X-ray CT imaging systems. An X-ray tube’s electron filament, thin wire, and metal target produce a picture of the electrons’ target. A small rectangular electron source modeled electron filaments. An electron source target was a thin, 19,290 kg/m3 tungsten cube in a tubular hoover chamber. The electron source–object axis of the simulation object is 20° from the vertical. For most medical X-ray imaging applications, the kerma of the air was calculated at a variety of discrete locations within the conical X-ray beam, providing an accurate data set for network training. Various locations were taken into account in the aforementioned voltages inside the radiation field as the input of the GMDH network. For diagnostic radiology applications, the trained GMDH model could determine the air kerma at any location in the X-ray field of view and for a wide range of X-ray tube voltages with a Mean Relative Error (MRE) of less than 0.25%. This study yielded the following results: (1) The heel effect is included when calculating air kerma. (2) Computing the air kerma using an artificial neural network trained with minimal data. (3) An artificial neural network quickly and reliably calculated air kerma. (4) Figuring out the air kerma for the operating voltage of medical tubes. The high accuracy of the trained neural network in determining air kerma guarantees the usability of the presented method in operational conditions.

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“…With the de vel op ment of nu clear sci ence and tech nol ogy, the de mands of in situ cal i bra tion of nuclear de tec tors are ob vi ously in creas ing. In gamma me trol ogy field, re mov able cal i bra tion de vices are devel oped for the cal i bra tion of area and por ta ble gamma de tec tors, as well as per sonal do sim e ters [14,15]. In neu tron me trol ogy field, no rel a tive re searches on such re mov able cal i bra tion de vices are re ported.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo simulation study on the 241Am-Be radionuclide source reference neutron radiation

et al. 2020

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In order to study the feasibility of using lightweight 241Am-Be radionuclide reference neutron radiation field for the calibration of neutron measurement instruments, this paper reported the Monte Carlo simulation work on free field reference neutron radiation, standard reference neutron radiation regulated by ISO-8529 series standards and minitype reference neutron radiation we designed. The distributions of dose equivalent rates and neutron energy spectrum in different conditions, such as different room types, different room sizes and different shield materials were the main simulation contents for analyzing the characteristics of the three types of reference neutron radiation. According to the simulation results, theoretical supports were provided for the discussion on the minitype reference neutron radiation for calibration purpose.

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Determination of the conventional true value of gamma-ray air kerma in a minitype reference radiation

Cited by 13 publications

References 15 publications

An in-situ calibration device for portable gamma dosimeters based on minitype reference radiation

An in-situ calibration device for portable gamma dosimeters based on minitype reference radiation

Air Kerma Calculation in Diagnostic Medical Imaging Devices Using Group Method of Data Handling Network

Monte Carlo simulation study on the 241Am-Be radionuclide source reference neutron radiation

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