W Values in Propane-Based Tissue-Equivalent Gas

Bronić, Ines Krajcar

doi:10.1093/oxfordjournals.rpd.a031969

Cited by 14 publications

(9 citation statements)

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“…The W-values of silicon and diamond can be assumed to be almost constant with the ion type and energy, since they have no excitation and vibration levels, but only phonons that involve only a small amount of energy. The case of propane is different, since the W-value at the carbon edge (4 MeV carbon ions) is 31.6 eV [23]. The spectra calibration procedure has implicitly used this W-value to convert the ionisation events to imparted energy, although the W-value changes with the ion type and energy.…”

Section: Microdosimetric Spectramentioning

confidence: 99%

“…The spectra calibration procedure has implicitly used this W-value to convert the ionisation events to imparted energy, although the W-value changes with the ion type and energy. For instance, the W-value of 62 MeV/u 12 C ions is 27.4 eV [23]. Because of that, the same imparted energy of different ions can give rise to ionisation events of different size.…”

Section: Microdosimetric Spectramentioning

confidence: 99%

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Miniaturized microdosimeters as LET monitors: First comparison of calculated and experimental data performed at the 62 MeV/u 12C beam of INFN-LNS with four different detectors

et al. 2018

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Section: Microdosimetric Spectramentioning

confidence: 99%

Section: Microdosimetric Spectramentioning

confidence: 99%

Miniaturized microdosimeters as LET monitors: First comparison of calculated and experimental data performed at the 62 MeV/u 12C beam of INFN-LNS with four different detectors

et al. 2018

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“…The detector and the calibration method have been already described in the work of Cesari et al 9 . In order to transfer the calibration for alpha-particles to photons, the ratio W el /W  was applied 10 .…”

Section: Experimental Calibration Of the Marker Pointmentioning

confidence: 99%

Lineal energy calibration of mini tissue-equivalent gas-proportional counters (TEPC)

Conte

Moro

Großwendt³

et al. 2013

AIP Conference Proceedings

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Mini TEPCs are cylindrical gas proportional counters of 1 mm or less of sensitive volume diameter. The lineal energy calibration of these tiny counters can be performed with an external gamma-ray source. However, to do that, first a method to get a simple and precise spectral mark has to be found and then the keV/µm value of this mark. A precise method (less than 1% of uncertainty) to identify this mark is described here, and the lineal energy value of this mark has been measured for different simulated site sizes by using a 137 Cs gamma source and a cylindrical TEPC equipped with a precision internal 244 Cm alpha-particle source, and filled with propane-based tissue-equivalent gas mixture. Mini TEPCs can be calibrated in terms of lineal energy, by exposing them to 137 Cesium sources, with an overall uncertainty of about 5%.

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“…The ideal detector response to a beam of 4.6 MeV alphas interacting with a volume of 2 × 5 × 1 cm of propane at 400 Pa was simulated, using the Geant4 toolkit [13], in order to estimate the detector efficiency. The low energy Livermore cross-sections for propane were used to calculate the energy deposited in the working gas and the number of ionizations produced was calculated as the ratio of the energy deposited and the W value for alphas in propane (27 eV [14]). The resulting expected mean cluster size is two orders of magnitude larger than the average number of measured counts per trigger.…”

Section: Resultsmentioning

confidence: 99%

A novel approach to study radiation track structure with nanometer-equivalent resolution

et al. 2014

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Clustered DNA damages are considered the critical lesions in the pathways leading from the initial energy deposition by radiation to radiobiological damage. The spatial distribution of the initial DNA damage is mainly determined by radiation track-structure at the nanometer level. In this work, a novel experimental approach to image the three-dimensional structure of micrometric radiation track segments is presented. The approach utilizes the detection of single ions created in low-pressure gas. Ions produced by radiation drift towards a GEM-like 2D hole-pattern detector. When entering individual holes, ions can induce ion-impact ionization of the working-gas starting a confined electron avalanche that generates the output signal. By registering positive ions rather than electrons, diffusion is reduced and a spatial resolution of the track image of the order of water-equivalent nanometers can be achieved. Measurements and simulations to characterize the performance of a few detector designs were performed. Different cathode materials were tested and ionization cluster size distributions of 241 Am alpha particles were measured. The electric field configuration in the detector was calculated to optimize the ion focusing into the detector holes. The preliminary results obtained show the directions for further development of the detector.

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W Values in Propane-Based Tissue-Equivalent Gas

Cited by 14 publications

References 0 publications

Miniaturized microdosimeters as LET monitors: First comparison of calculated and experimental data performed at the 62 MeV/u 12C beam of INFN-LNS with four different detectors

Miniaturized microdosimeters as LET monitors: First comparison of calculated and experimental data performed at the 62 MeV/u 12C beam of INFN-LNS with four different detectors

Lineal energy calibration of mini tissue-equivalent gas-proportional counters (TEPC)

A novel approach to study radiation track structure with nanometer-equivalent resolution

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W Values in Propane-Based Tissue-Equivalent Gas

Cited by 14 publications

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Miniaturized microdosimeters as LET monitors: First comparison of calculated and experimental data performed at the 62 MeV/u 12C beam of INFN-LNS with four different detectors

Miniaturized microdosimeters as LET monitors: First comparison of calculated and experimental data performed at the 62 MeV/u 12C beam of INFN-LNS with four different detectors

Lineal energy calibration of mini tissue-equivalent gas-proportional counters (TEPC)

A novel approach to study radiation track structure with nanometer-equivalent resolution

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Product

Resources

About

Miniaturized microdosimeters as LET monitors: First comparison of calculated and experimental data performed at the 62 MeV/u 12C beam of INFN-LNS with four different detectors

Miniaturized microdosimeters as LET monitors: First comparison of calculated and experimental data performed at the 62 MeV/u 12C beam of INFN-LNS with four different detectors