Abstract
The use of small-size alanine dosimeters presents a challenge because the signal intensity is less than the spectrometer sensitivity. K-band (24 GHz) EPR spectrometer seems to be a good compromise between size and sensitivity of the sample. Miniature alanine pellets were evaluated for small-field radiation dosimetry. Dosimeters of DL-alanine/PVC with dimensions of 1.5 mm diameter and 2.5 mm length with 5 mg mass were developed. These dosimeters were irradiated with 10 MV X-rays in the dose range 0.05-60 Gy and the first harmonic (1 h) spectra were recorded. Microwave power, frequency and amplitude of modulation were optimized to obtain the best signal-to-noise ratio (S/N). For beam profile determination, a group of 25 dosimeters were placed in an acrylic device with dimensions of (7.5x2.5x1) cm{sup 3} and irradiated with a (3x3) cm{sup 2} 10 MV X-rays beam field size. The dose at the central region of the beam was 20 Gy at a depth of 2.2 cm (build up for acrylic). The acrylic device was oriented perpendicular to the beam axis and to the gantry rotation axis. For the purposes of comparison of the spatial resolution, the beam profile was also determined with a radiographic film and 2 mm aperture optical
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Chen, Felipe;
[1]
Department of Radiological Health, Caja de Seguro Social, Panama City (Panama);
Department of Physics, Faculty of Natural and Exact Sciences and Technology, University of Panama, Panama City (Panama)];
Graeff, Carlos F.O.;
[1]
Baffa, Oswaldo
[1]
- Departmento de Fisica e Matematica, FFCLRP-Universidade de Sao Paulo, Av. Bandeirantes, 3900, 14040-901, Ribeirao Preto-SP (Brazil)
Citation Formats
Chen, Felipe, Department of Radiological Health, Caja de Seguro Social, Panama City (Panama), Department of Physics, Faculty of Natural and Exact Sciences and Technology, University of Panama, Panama City (Panama)], Graeff, Carlos F.O., and Baffa, Oswaldo.
K-band EPR dosimetry: small-field beam profile determination with miniature alanine dosimeter.
United Kingdom: N. p.,
2005.
Web.
doi:10.1016/j.apradiso.2004.08.036.
Chen, Felipe, Department of Radiological Health, Caja de Seguro Social, Panama City (Panama), Department of Physics, Faculty of Natural and Exact Sciences and Technology, University of Panama, Panama City (Panama)], Graeff, Carlos F.O., & Baffa, Oswaldo.
K-band EPR dosimetry: small-field beam profile determination with miniature alanine dosimeter.
United Kingdom.
https://doi.org/10.1016/j.apradiso.2004.08.036
Chen, Felipe, Department of Radiological Health, Caja de Seguro Social, Panama City (Panama), Department of Physics, Faculty of Natural and Exact Sciences and Technology, University of Panama, Panama City (Panama)], Graeff, Carlos F.O., and Baffa, Oswaldo.
2005.
"K-band EPR dosimetry: small-field beam profile determination with miniature alanine dosimeter."
United Kingdom.
https://doi.org/10.1016/j.apradiso.2004.08.036.
@misc{etde_20620169,
title = {K-band EPR dosimetry: small-field beam profile determination with miniature alanine dosimeter}
author = {Chen, Felipe, Department of Radiological Health, Caja de Seguro Social, Panama City (Panama), Department of Physics, Faculty of Natural and Exact Sciences and Technology, University of Panama, Panama City (Panama)], Graeff, Carlos F.O., and Baffa, Oswaldo}
abstractNote = {The use of small-size alanine dosimeters presents a challenge because the signal intensity is less than the spectrometer sensitivity. K-band (24 GHz) EPR spectrometer seems to be a good compromise between size and sensitivity of the sample. Miniature alanine pellets were evaluated for small-field radiation dosimetry. Dosimeters of DL-alanine/PVC with dimensions of 1.5 mm diameter and 2.5 mm length with 5 mg mass were developed. These dosimeters were irradiated with 10 MV X-rays in the dose range 0.05-60 Gy and the first harmonic (1 h) spectra were recorded. Microwave power, frequency and amplitude of modulation were optimized to obtain the best signal-to-noise ratio (S/N). For beam profile determination, a group of 25 dosimeters were placed in an acrylic device with dimensions of (7.5x2.5x1) cm{sup 3} and irradiated with a (3x3) cm{sup 2} 10 MV X-rays beam field size. The dose at the central region of the beam was 20 Gy at a depth of 2.2 cm (build up for acrylic). The acrylic device was oriented perpendicular to the beam axis and to the gantry rotation axis. For the purposes of comparison of the spatial resolution, the beam profile was also determined with a radiographic film and 2 mm aperture optical densitometer; in this case the dose was 1 cGy. The results showed a similar spatial resolution for both types of dosimeters. The dispersion in dose reading was larger for alanine in comparison with the film, but alanine dosimeters can be read faster and more directly than film over a wide dose range.}
doi = {10.1016/j.apradiso.2004.08.036}
journal = []
issue = {2}
volume = {62}
journal type = {AC}
place = {United Kingdom}
year = {2005}
month = {Feb}
}
title = {K-band EPR dosimetry: small-field beam profile determination with miniature alanine dosimeter}
author = {Chen, Felipe, Department of Radiological Health, Caja de Seguro Social, Panama City (Panama), Department of Physics, Faculty of Natural and Exact Sciences and Technology, University of Panama, Panama City (Panama)], Graeff, Carlos F.O., and Baffa, Oswaldo}
abstractNote = {The use of small-size alanine dosimeters presents a challenge because the signal intensity is less than the spectrometer sensitivity. K-band (24 GHz) EPR spectrometer seems to be a good compromise between size and sensitivity of the sample. Miniature alanine pellets were evaluated for small-field radiation dosimetry. Dosimeters of DL-alanine/PVC with dimensions of 1.5 mm diameter and 2.5 mm length with 5 mg mass were developed. These dosimeters were irradiated with 10 MV X-rays in the dose range 0.05-60 Gy and the first harmonic (1 h) spectra were recorded. Microwave power, frequency and amplitude of modulation were optimized to obtain the best signal-to-noise ratio (S/N). For beam profile determination, a group of 25 dosimeters were placed in an acrylic device with dimensions of (7.5x2.5x1) cm{sup 3} and irradiated with a (3x3) cm{sup 2} 10 MV X-rays beam field size. The dose at the central region of the beam was 20 Gy at a depth of 2.2 cm (build up for acrylic). The acrylic device was oriented perpendicular to the beam axis and to the gantry rotation axis. For the purposes of comparison of the spatial resolution, the beam profile was also determined with a radiographic film and 2 mm aperture optical densitometer; in this case the dose was 1 cGy. The results showed a similar spatial resolution for both types of dosimeters. The dispersion in dose reading was larger for alanine in comparison with the film, but alanine dosimeters can be read faster and more directly than film over a wide dose range.}
doi = {10.1016/j.apradiso.2004.08.036}
journal = []
issue = {2}
volume = {62}
journal type = {AC}
place = {United Kingdom}
year = {2005}
month = {Feb}
}