FABRICATION OF FREE AIR WELL TYPE IONIZATION CHAMBER AND CALCULATIONAL ASSESSMENT AND MEASUREMENT OF ITS OPERATIONAL CHARACTERISTICS

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ARBABI KOROUSH; RAISALI GHOLAMREZA; DEHGHANI MOGHADAM MASOOMEH; GHAFOORI MOSTAFA; SHAHVAR ARJANG; HAMIDI SAID

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Journal: IRANIAN JOURNAL OF MEDICAL PHYSICS Year:2008 | Volume:4 | Issue:2 (16-17) Page(s): 1-10

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Title

FABRICATION OF FREE AIR WELL TYPE IONIZATION CHAMBER AND CALCULATIONAL ASSESSMENT AND MEASUREMENT OF ITS OPERATIONAL CHARACTERISTICS

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Keywords

WEN TYPE CHAMBERQ3

BRACHYTHERAPY GAMMA SOURCESQ3

AIR KERMA STRENGTHQ3

MCNP-4CQ3

Abstract

Introduction: Well type ionization chamber is a measuring device which is used to determine the activity of brachytherapy sources. The chamber has a cylindrical volume in which a cylindrical tube is mounted in the middle of the chamber. For the measurements, the brachytherapy sources are transferred to the middle of the tube.Materials and Methods: For designing the WEN TYPE CHAMBER, the measurement principals of WEN TYPE CHAMBERs were considered and MCNP-4C code as a calculation tool was used. The designed chamber was simulated and the response of the chamber was evaluated. In this investigation, the chamber operational parameters such as operating voltage, leakage current, reproducibility, reference measuring point, recombination and polarization factors as well as response stability for 137Cs, 57CO and 241Am sources were studied.Results: The chamber leakage currents at the operating voltage in comparison to the chamber response for the measurement of the above mentioned sources were negligible. The responses of the fabricated chamber for these sources are reproducible and its reference measurement position for these sources was obtained at 6 cm from the bottom of the chamber. The recombination factor for the well type chamber was negligible and the polarization factor is close to 1. Therefore, these two factors were not considered in the measurements. The reproducibility of the measurements in different intervals shows the stability of the chamber response for each source. Also the results of the chamber current measurement in term of source strength were compared to the response of the simulated chamber for different source positions and energy ranges of the used sources.Discussion and Conclusion: The results show that the measurement of the reference positions for each source in the simulated and fabricated chamber is quite in a good agreement. Regarding the reliable operational properties of the fabricated chamber, this chamber can be used to determine the activities of brachytherapy sources in which the energy ranges are greater than 50 KeV.

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APA: Copy

ARBABI, KOROUSH, RAISALI, GHOLAMREZA, DEHGHANI MOGHADAM, MASOOMEH, GHAFOORI, MOSTAFA, SHAHVAR, ARJANG, & HAMIDI, SAID. (2008). FABRICATION OF FREE AIR WELL TYPE IONIZATION CHAMBER AND CALCULATIONAL ASSESSMENT AND MEASUREMENT OF ITS OPERATIONAL CHARACTERISTICS. IRANIAN JOURNAL OF MEDICAL PHYSICS, 4(2 (16-17)), 1-10. SID. https://sid.ir/paper/96999/en

Vancouver: Copy

ARBABI KOROUSH, RAISALI GHOLAMREZA, DEHGHANI MOGHADAM MASOOMEH, GHAFOORI MOSTAFA, SHAHVAR ARJANG, HAMIDI SAID. FABRICATION OF FREE AIR WELL TYPE IONIZATION CHAMBER AND CALCULATIONAL ASSESSMENT AND MEASUREMENT OF ITS OPERATIONAL CHARACTERISTICS. IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2008;4(2 (16-17)):1-10. Available from: https://sid.ir/paper/96999/en

IEEE: Copy

KOROUSH ARBABI, GHOLAMREZA RAISALI, MASOOMEH DEHGHANI MOGHADAM, MOSTAFA GHAFOORI, ARJANG SHAHVAR, and SAID HAMIDI, “FABRICATION OF FREE AIR WELL TYPE IONIZATION CHAMBER AND CALCULATIONAL ASSESSMENT AND MEASUREMENT OF ITS OPERATIONAL CHARACTERISTICS,” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 4, no. 2 (16-17), pp. 1–10, 2008, [Online]. Available: https://sid.ir/paper/96999/en

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