Angular response of alanine samples: From powder to pellet

“…Theoretically a 60 mg sample, considering the small spherical grain size (165 m average diameter), has a very small volume; therefore it is unrealistic to consider the sample as truly polycrystalline. Previous results (Dolo and Garcia, 2007) have shown that granulometry and the observed angular response seem to play an active role in the stability of radicals and their spatial reorganization versus time. Grain size and available surface have not previously been taken into account in simulations.…”

Section: Introductionmentioning

confidence: 78%

Study of the influence of grain size on the ESR angular response in alanine radicals

Garcia

Dolo

2007

Radiation Measurements

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“…The 90 • rotation was then chosen for our measurements. This is also the procedure at other alanine dosimetry services [2,15], although the acquisition of spectra at a higher number of orientations would be preferred if time was not an issue [16].…”

Section: Signal Anisotropymentioning

confidence: 99%

Development of an alanine dosimetry system for radiation dose measurements in the radiotherapy range

et al. 2015

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Alanine/ESR systems provide an interesting alternative to standard dosimetry systems like solid state or gas ionization chambers for dosimetry in radiotherapy. This is primarily due to the negligible energy dependence, high stability, and the possibility of using small pellets that are especially suitable for the dosimetry of small fields. In order to obtain acceptable dose uncertainties in the radiotherapy dose range, the setup, operational parameters and quantification methods need to be carefully investigated and optimized. In this work we present the development of an alanine/ESR dosimetry system, traced to the secondary standard laboratory of absorbed dose to water at the Radiation Physics Laboratory of the Universidade de Santiago de Compostela (Spain). We focus on the setup, the optimization of the operational parameters of the ESR spectrometer, the quantification of the readout signal and the construction of a calibration curve. The evaluation of the uncertainty budget is also a key component of an alanine/ESR system for radiotherapy dosimetry, and is presented in detail.After the optimization of the procedures, we have achieved a relative uncertainty of 1.7% (k=2) for an absorbed dose of 10 Gy, decreasing to 0.9% for 50 Gy.

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Angular response of alanine samples: From powder to pellet

Cited by 8 publications

References 12 publications

A methodology for choosing parameters for ESR readout of alanine dosimeters for radiotherapy

A methodology for choosing parameters for ESR readout of alanine dosimeters for radiotherapy

Study of the influence of grain size on the ESR angular response in alanine radicals

Development of an alanine dosimetry system for radiation dose measurements in the radiotherapy range

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