Development and Verification of an Online Monitoring Ionization Chamber for Dose Measurement in a Small-Sized Betatron
Source abstract
Abstract
Online radiation dose monitoring is critical for the safe operation of accelerators. Although commercial dose monitors are well-developed, integrating an ionization chamber directly within a small-sized Betatron magnet remains challenging. In this study, we designed an air ionization chamber tailored for real-time dose monitoring in a small-sized Betatron. We selected aluminum for the chamber wall based on structural and integration requirements, designed the cavity geometry, and developed the associated charge collection and sampling circuits. Using a standard reference PTW ionization chamber, we calibrated the output voltage of the chamber against X-ray dose rates and conducted stability tests. The results show that there is a very good linear relationship between the output voltage of the ionization chamber and the X-ray dose rate. The relative standard deviation of the dose rate data within a 10 min working cycle is 3.25%, and the dose rate data shows good consistency with the standard reference ionization chamber. The ionization chamber can ensure operational safety for a small-sized Betatron and offer guidance for similar applications.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Advanced Radiotherapy Techniques · Particle Accelerators and Free-Electron Lasers · Radiation Therapy and Dosimetry
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
National Key Laboratory of Uranium Resource Exploration-Mining and Nuclear Remote Sensing, East China University of Technology, Nanchang 330013, China
Jiangxi Province Engineering Research Center of New Energy Technology and Equipment, East China University of Technology, Nanchang 330013, China
Funding
National Natural Science Foundation of China · Key Research and Development Project of Jiangxi Province · Jiangxi Provincial Natural Science Foundation · National Key Laboratory of Uranium Resource Exploration-Mining and Nuclear Remote Sensing
References (23)
Show source-provided references
1. Electron beam scattering device for FLASH preclinical studies with 6-MeV LINAC10.1016/j.net.2020.09.019 ↗
2. X-band Linac for a 6 MeV dual-head radiation therapy gantry10.1016/j.nima.2016.11.034 ↗
3. Acceleration of electrons by magnetic induction10.1103/PhysRev.58.841 ↗
4. Design and optimization of thermal neutron activation device based on 5 MeV electron linear accelerator10.1016/j.net.2023.07.046 ↗
5. Design and simulation of a LINAC for high energy electron radiography research10.1016/j.nima.2018.09.133 ↗
6. Electron accelerators for novel cargo inspection methods10.1016/j.phpro.2017.09.036 ↗
7. A betatron tomograph for nondestructive testing of products with a diameter up to 1000 mm made of high-energy materials10.1134/S1061830919040077 ↗
8. Real-time monitoring of ultra-high dose rate electron beams using bremsstrahlung photons10.1016/j.net.2023.05.033 ↗
9. Development of a device to improve the precision of water surface identification for MeV electron beam dosimetry10.1016/j.net.2023.11.047 ↗
10. Multi-concentric-ring open-air ionization chamber for high-intensity X-ray beams10.1016/j.nima.2014.06.031 ↗
11. Ionization chamber dosimetry for photon and electron beams10.3109/02841867709134310 ↗
12. Air ionization chamber combined with LiCaAlF6 scintillator for γ-ray dose evaluation in boron neutron capture therapy10.1016/j.nima.2022.167883 ↗
13. A free-air ionization chamber with a large aperture diaphragm10.1016/j.nima.2010.02.083 ↗
14. PTW (2024, July 02). Farmer Ionization Chamber 30013 Specifications. Available online: https://www.ptwdosimetry.com/en/products/farmer-ionization-chamber-30013-waterproof.
15. Bilateral comparison of the absorbed dose to water in high energy X-ray beams between the KRISS and the NMIJ10.1016/j.net.2019.12.011 ↗
16. PTW (2024, July 02). X-Ray Therapy Monitor Chamber 7862 Specifications. Available online: https://www.ptwdosimetry.com/en/products/x-ray-therapy-monitor-chamber-7862.
17. A swallowable X-ray dosimeter for the real-time monitoring of radiotherapy10.1038/s41551-023-01024-2 ↗
18. Simulation analysis and experiment of magnetic pole shape influence on betatron magnetic field10.2298/NTRP2201001L ↗
19. Development of a pulsed magnetic field power supply for small size Betatron10.1016/j.net.2024.07.056 ↗
20. Cavity ionization as a function of wall material10.6028/jres.060.028 ↗
21. Seltzer, S.M., Fernandez-Varea, J.M., Andreo, P., Bergstrom, P.M., Burns, D.T., Krajcar Bronić, I., Ross, C.K., and Salvat, F. (2016). Key Data for Ionizing-Radiation Dosimetry: Measurement Standards and Applications, Oxford University Press. Available online: http://fulir.irb.hr/id/eprint/3302.
22. Wyckoff, H.O., and Attiix, F.H. (1957). Design of Free-Air Ionization Chambers.10.6028/NBS.HB.64 ↗
23. International Atomic Energy Agency (2000). IAEA Technical Reports Series No. 398: Absorbed Dose Determination in External Beam Radiotherapy, IAEA.