Design, fabrication and characterization of a windowless extrapolation chamber for low-energy X-rays: Experimental and Monte Carlo results

Vahabi, Seyed Milad; Zafarghandi, Mojtaba Shamsaie

doi:10.1016/j.vacuum.2018.10.081

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…Where 𝑀 𝑥 is the charge collected at 𝑉 𝑥 voltage and at 𝑉 1 /𝑉 2 = 2 [12]. In this experiment, the N-30, N-40 and N-60 radiation quality was selected, and the tube current was set to 5 mA for measurement under the working conditions.…”

Section: Ion Collection Efficiencymentioning

confidence: 99%

Development and performance testing of a chamber for absorbed dose in water absolute measurement for ¹²⁵I brachytherapy seeds

Hang,

Liu,

Song

et al. 2024

J. Inst.

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The application of more and more low-energy, low-dose-rate photon radiation seeds in brachytherapy. According to the TG43 report and TG43-U1 report issued by the American Association of Physicists in Medicine, both apparent activity and air kerma strength are physical characterization parameters of brachytherapy seed strength,which are needed to convert into water absorbed dose at the depth of 1 cm. At present, the method of obtaining the water absorbed dose is to convert the air kerma strength, the uncertainty of results exceeds 5% (k = 1), which could reduce the cure rate of the treatment. In order to address this issue ,the China Institute of Atomic Energy has designed a device that can directly replicate the water absorbed dose of 125I brachytherapy seeds,which is an extrapolation chamber embedded with water equivalent material. In order to evaluate the performance of the extrapolation chamber, a series of experiments were carried out, including partial pressure test, leakage current, saturation curve, response linearity, collection area and zero point position. The test results show that the performance parameters of the extrapolation chamber meet the relevant requirements.

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Section: Ion Collection Efficiencymentioning

confidence: 99%

Development and performance testing of a chamber for absorbed dose in water absolute measurement for ¹²⁵I brachytherapy seeds

Hang,

Liu,

Song

et al. 2024

J. Inst.

View full text Add to dashboard Cite

show abstract

“…Poymers can be also used for construction of dosimeters as well as phantoms. Therefore, the multi-layers of polymers and other materials such as graphite as an electrode, are important during the design of radiation detectors (pre-fabrication phase) [9].…”

Section: Introductionmentioning

confidence: 99%

Investigations of effective attenuation coefficients (EACs) of multi-layered polymers using Monte Carlo method

Vahabi¹,

Zafarghandi²

2020

Phys. Scr.

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In the present study, a Monte Carlo model has been developed to compute the EACs of some multi-layered materials, especially polymers for the first time. Different mono-energetic gamma rays with energy range between 59.5 and 1332.5 keV were considered to accomplish this goal. A comparison was made between the simulation results and those derived from a theoretical formula based on available measured attenuation coefficients and data taken from the XCOM program. A highly agreement was achieved. This study shows an improvement over Al-Arif an Kakil’s work, in the sense that the modified model is appropriate enough to estimate the EACs within ±1.5%. It was indicated that changing the order of the materials did not vary the results significantly. The results showed that the proposed model can be used to determine radiation properties of multi-layer polymers in cases where no analogous experimental data exist or it is expensive to test.

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Investigations of radiation properties, photon interaction parameters and water equivalence of some polymers used in the construction of ionization chambers for low energy X-ray beams

Vahabi

Zafarghandi

2020

Measurement

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Design, fabrication and characterization of a windowless extrapolation chamber for low-energy X-rays: Experimental and Monte Carlo results

Cited by 5 publications

References 25 publications

Development and performance testing of a chamber for absorbed dose in water absolute measurement for ¹²⁵I brachytherapy seeds

Development and performance testing of a chamber for absorbed dose in water absolute measurement for ¹²⁵I brachytherapy seeds

Investigations of effective attenuation coefficients (EACs) of multi-layered polymers using Monte Carlo method

Investigations of radiation properties, photon interaction parameters and water equivalence of some polymers used in the construction of ionization chambers for low energy X-ray beams

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Design, fabrication and characterization of a windowless extrapolation chamber for low-energy X-rays: Experimental and Monte Carlo results

Cited by 5 publications

References 25 publications

Development and performance testing of a chamber for absorbed dose in water absolute measurement for 125I brachytherapy seeds

Development and performance testing of a chamber for absorbed dose in water absolute measurement for 125I brachytherapy seeds

Investigations of effective attenuation coefficients (EACs) of multi-layered polymers using Monte Carlo method

Investigations of radiation properties, photon interaction parameters and water equivalence of some polymers used in the construction of ionization chambers for low energy X-ray beams

Contact Info

Product

Resources

About

Development and performance testing of a chamber for absorbed dose in water absolute measurement for ¹²⁵I brachytherapy seeds

Development and performance testing of a chamber for absorbed dose in water absolute measurement for ¹²⁵I brachytherapy seeds