TY - JOUR
T1 - Alanine films for EPR dosimetry of low-energy (1-30 keV) X-ray photons
AU - Principato, Fabio
AU - Abbene, Leonardo
AU - Bartolotta, Antonio
AU - Collura, Giorgio
AU - D'Oca, Maria Cristina
AU - Marrale, Maurizio
AU - Marrale, null
AU - Collura, null
AU - Bartolotta, null
AU - D'Errico, null
AU - D'Oca, null
AU - D'Errico, null
AU - D'Oca, null
AU - D'Oca, null
AU - D'Oca, null
AU - D'Errico, Francesco
AU - D'Errico, Francesco
PY - 2019
Y1 - 2019
N2 - L-alpha-alanine has aroused considerable interest for use in radiation EPR dosimetry and has been formally accepted as a secondary standard for high-dose (kGy) and transfer dosimetry of high-energy photons and electrons. In this work, we extended the investigation of the energy response of alanine EPR films in the low energy range for X-photons (1-30 keV). Electron Paramagnetic Resonance (EPR) measurements were performed on Kodak BioMax alanine films exposed to low-energy X-rays from a Cu-, W- and Mo-targets tube operating at voltages up to 30 kV. Films were chosen because of the low penetration of the soft X-rays used. The response of alanine to low-energy X-rays was characterized experimentally and the relative response (with respect to high energy photons) was found to be between 0.8 and 0.9 for Cu- and W-tube X-rays, and 1.0 for Mo-tube X-rays. The attenuation profiles were investigated and it was found that 1 mm of film material reduces the intensity of the X-ray-beam by about 70%, 50% and 40% for Cu-, W- and Mo-tube X-rays, respectively. Monte Carlo simulations were performed to model the energy release as well as the depth dose profiles for the various radiation beams used. These data are considered relevant for dosimetric applications in low energy beams such the high-gradient treatment fields used in monoenergetic microbeam radiation therapy (MRT) with synchrotron radiation as well as in brachytherapy with low energy sources, for instance Yb-169.
AB - L-alpha-alanine has aroused considerable interest for use in radiation EPR dosimetry and has been formally accepted as a secondary standard for high-dose (kGy) and transfer dosimetry of high-energy photons and electrons. In this work, we extended the investigation of the energy response of alanine EPR films in the low energy range for X-photons (1-30 keV). Electron Paramagnetic Resonance (EPR) measurements were performed on Kodak BioMax alanine films exposed to low-energy X-rays from a Cu-, W- and Mo-targets tube operating at voltages up to 30 kV. Films were chosen because of the low penetration of the soft X-rays used. The response of alanine to low-energy X-rays was characterized experimentally and the relative response (with respect to high energy photons) was found to be between 0.8 and 0.9 for Cu- and W-tube X-rays, and 1.0 for Mo-tube X-rays. The attenuation profiles were investigated and it was found that 1 mm of film material reduces the intensity of the X-ray-beam by about 70%, 50% and 40% for Cu-, W- and Mo-tube X-rays, respectively. Monte Carlo simulations were performed to model the energy release as well as the depth dose profiles for the various radiation beams used. These data are considered relevant for dosimetric applications in low energy beams such the high-gradient treatment fields used in monoenergetic microbeam radiation therapy (MRT) with synchrotron radiation as well as in brachytherapy with low energy sources, for instance Yb-169.
KW - Alanine
KW - Electron paramagnetic resonance
KW - Low energy photons
KW - Alanine
KW - Electron paramagnetic resonance
KW - Low energy photons
UR - http://hdl.handle.net/10447/373609
M3 - Article
VL - 459
SP - 1
EP - 6
JO - NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS
JF - NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS
SN - 0168-583X
ER -