Dosimetry and microdosimetry of monoenergetic neutrons using recombination chamber – Measurements and Monte Carlo simulations

Maciak, Maciej; Tulik, Piotr

doi:10.1016/j.radmeas.2022.106861

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…The REM-2 recombination chamber, by virtue of to its design (large volume) and construction materials (tissue equivalent), is designed to measure the absorbed dose rate at a depth of 10 mm

, the ambient dose equivalent at a depth of 10 mm

and the ambient radiation quality factor of mixed radiation fields

[ 5 , 6 ]. Such chambers are designed for environmental dosimetry measurements for radiation protection in radiation fields of unknown compositions and energy spectrums.…”

Section: Methodsmentioning

confidence: 99%

A Sub-Picoampere Measurement Algorithm for Use in Dosimetry of Time-Varying Radiation Fields

Kuć,

Maciak,

Tulik

2024

Sensors

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Dosimetry based on gas detectors operating in the recombination and saturation region provides unique research opportunities but requires high-quality electrometers with a measuring range below 1 pA (10−12 A). The standard approach in electrometry is to strive to increase the accuracy and precision of the measurement, ignoring the importance of its duration. The article presents an algorithm for the measurement of low current values (from 100 fA) that allows both a fast measurement (with a step of 2.3 ms) and high accuracy (measurement error below 0.1%), depending on the measurement conditions and the expected results. A series of tests and validations of the algorithm were carried out in a measurement system with a Keithley 6517B electrometer and a REM-2 recombination chamber under conditions of constant and time-varying radiation fields. The result of the work is a set of parameters that allow for the optimisation of the operation of the algorithm, maximising the quality of the measurements according to needs and the expected results. The algorithm can be used in low current measurement systems, e.g., for dosimetry of mixed radiation fields using recombination methods and chambers.

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“…The REM-2 recombination chamber, by virtue of to its design (large volume) and construction materials (tissue equivalent), is designed to measure the absorbed dose rate at a depth of 10 mm

, the ambient dose equivalent at a depth of 10 mm

and the ambient radiation quality factor of mixed radiation fields

[ 5 , 6 ]. Such chambers are designed for environmental dosimetry measurements for radiation protection in radiation fields of unknown compositions and energy spectrums.…”

Section: Methodsmentioning

confidence: 99%

A Sub-Picoampere Measurement Algorithm for Use in Dosimetry of Time-Varying Radiation Fields

Kuć,

Maciak,

Tulik

2024

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…The REM-2 recombination chamber can be considered equivalent to the International Commission on Radiation Units and Measurements (ICRU) sphere and can be used for direct measurement of H*(10) without any corrections to the calibration factor in most measurements for radiation protection purposes. Detailed information on the construction and properties of REM-2 and GW2 recombination chambers can be found in other publications [14][15][16][17]. In particular, as detectors with a LET-dependent response, they give the unique opportunity for an experimental measurement of the quantity representing the radiation quality (a function of the unrestricted linear energy transfer Q(L) in water).…”

Section: Recombination Chambersmentioning

confidence: 99%

A dosimetric comparison of 3D-CRT, IMRT and IMAT treatment techniques — assessment from radiation protection point of view

Tulik,

Maciak,

Tulik

2024

Rep Pract Oncol Radiother.

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Background:The purpose was to assess the impact of irradiation technique type and beam energy on the mixed radiation field around the medical linear accelerator (linac) in terms of radiation quality and related radiation protection quantities. Materials and methods:Seven radiotherapeutic plans with Alderson-Rando anthropomorphic phantom [different techniques: conventional three-dimensional conformal radiotherapy (3D-CRT), intensity-modulated radiotherapy (IMRT) and intensity modulated arc therapy (IMAT), different beams: 6 MV or 18 MV, and their arrangements) were prepared for the case of prostate malignancy. Recombination chambers REM-2 and GW2 were positioned on the treatment couch 100 cm from the beam axis at the height of the isocentre. Recombination chambers REM-2 and GW2 were used for recombination index of radiation quality Q 4 determination, measurement of total tissue dose D t and calculation of gamma and neutron components to D t . Estimation of D t and Q 4 allowed for the ambient dose equivalent H*(10) calculations for each plan.Results: For plans prepared with 6 MV beams, Q 4 values within the limits of uncertainty were equal to one, which confirms the correctness of the measurement method. For plans implemented with 18 MV beams, the value of Q 4 was in the range of 3.7-5.7. Comparison between treatment techniques indicates that the lowest exposure resulting from out-of-field doses comes from 6 MV IMAT (0.7 mSv), whereas the highest one is from 18 MV IMRT (55.1 mSv). Conclusion:With the recombination chambers technique it was confirmed that the choice of beam energy directly affects the generation of photoneutrons. The treatment plan technique can have a significant impact on the out-of-field dose.

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Dosimetry and microdosimetry of monoenergetic neutrons using recombination chamber – Measurements and Monte Carlo simulations

Cited by 2 publications

References 27 publications

A Sub-Picoampere Measurement Algorithm for Use in Dosimetry of Time-Varying Radiation Fields

A Sub-Picoampere Measurement Algorithm for Use in Dosimetry of Time-Varying Radiation Fields

A dosimetric comparison of 3D-CRT, IMRT and IMAT treatment techniques — assessment from radiation protection point of view

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