Characterization of a 2 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="mml19" display="inline" overflow="scroll" altimg="si19.gif"><mml:mo>×</mml:mo></mml:math> 2 array of large square bars of LaBr3:Ce detectors with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="mml20" display="inline" overflow="scroll" altimg="si1.gif"><mml:mi>γ</mml:mi></mml:math>-rays up to 22.5 MeV

Dhibar, M.; Mazumdar, I.; Chavan, P.B.; Patel, Sachin; Kumar, G. Anil

doi:10.1016/j.nima.2017.11.014

Cited by 10 publications

(2 citation statements)

References 37 publications

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“…The energy resolution of a 2″ × 2″ × 8″ LaBr 3 (Ce) crystal has been measured by Dhibar et al . 56 at several photon energies up to 4.433 MeV. Above ~2 MeV the energy resolution is around 3% FWHM (Full Width Half Maximum).…”

Section: Methodsmentioning

confidence: 98%

A New Method to Reconstruct in 3D the Emission Position of the Prompt Gamma Rays following Proton Beam Irradiation

Panaino

Mackay

Kirkby

et al. 2019

Sci Rep

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A new technique for range verification in proton beam therapy has been developed. It is based on the detection of the prompt γ rays that are emitted naturally during the delivery of the treatment. A spectrometer comprising 16 LaBr3(Ce) detectors in a symmetrical configuration is employed to record the prompt γ rays emitted along the proton path. An algorithm has been developed that takes as inputs the LaBr3(Ce) detector signals and reconstructs the maximum γ-ray intensity peak position, in full 3 dimensions. For a spectrometer radius of 8 cm, which could accommodate a paediatric head and neck case, the prompt γ-ray origin can be determined from the width of the detected peak with a σ of 4.17 mm for a 180 MeV proton beam impinging a water phantom. For spectrometer radii of 15 and 25 cm to accommodate larger volumes this value increases to 5.65 and 6.36 mm. For a 8 cm radius, with a 5 and 10 mm undershoot, the σ is 4.31 and 5.47 mm. These uncertainties are comparable to the range uncertainties incorporated in treatment planning. This work represents the first step towards a new accurate, real-time, 3D range verification device for spot-scanning proton beam therapy.

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Section: Methodsmentioning

confidence: 98%

A New Method to Reconstruct in 3D the Emission Position of the Prompt Gamma Rays following Proton Beam Irradiation

Panaino

Mackay

Kirkby

et al. 2019

Sci Rep

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“…Uncertainty also originates from the photo peak detection efficiency, estimated using GEANT4 simulations. We have worked extensively in characterisation and simulations of various inorganic scintillators over a wide range of energies [34,38,39]. The photo peak detection efficiency uncertainty was determined to be ∼1%.…”

Section: Protonmentioning

confidence: 99%

Measurement of proton induced absolute production cross-section of 6.13, 6.92 and 7.12 MeV γ-rays from ¹⁶O(p,p ′γ )¹⁶O reaction

Ranga,

Mazumdar,

Weppner

et al. 2024

J. Phys. G: Nucl. Part. Phys.

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In this article, we report the absolute production cross-section of 6.13, 6.92 and 7.12 MeV γ-rays from the 16O(p,p′γ)16O reaction for incident proton energy range of 8-16 MeV. Angular distributions of the three γ-rays have been measured for seven angles at 9 MeV proton energy. A detailed phenomenological optical model potential (OMP) was set up to analyse the cross-section data. The OMP parameters were optimised using elastic, polarization and total reaction data available in the literature for protons and neutrons. Low-lying states of 16O were coupled, the optical potential was deformed using deformation parameters, and several resonances were included in the calculations to account for the nuclear structure effects. The potentials so generated have been used to calculate the differential and total cross sections for both 16O(p,p′)16O and 16O(p,p′γ)16O reactions.Our calculated cross-sections are in fairly good agreement with our measured data for 6.13, 6.92 and 7.12 MeV γ-rays. However, there still exist discrepancies in reproduction of the finer details of the cross sections. The comparisons of the calculations with the data bring forth the rather complex roles of channel couplings, resonances in the p+16O system and target deformation in the variation of the cross sections with projectile energy. The increased contribution of nuclear structure effects in light mass nuclei, leads to an apparent loss of predictive power of the theoretical calculation, as we approach the low-energy region of less than 10 MeV projectile energy.

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Energy resolution of Compton electrons in LaCl3:Ce using compact digitizer

Kaintura

Ranga

Panwar

et al. 2021

J Radioanal Nucl Chem

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Characterization of a 2 × 2 array of large square bars of LaBr3:Ce detectors with γ-rays up to 22.5 MeV

Cited by 10 publications

References 37 publications

A New Method to Reconstruct in 3D the Emission Position of the Prompt Gamma Rays following Proton Beam Irradiation

A New Method to Reconstruct in 3D the Emission Position of the Prompt Gamma Rays following Proton Beam Irradiation

Measurement of proton induced absolute production cross-section of 6.13, 6.92 and 7.12 MeV γ-rays from ¹⁶O(p,p ′γ )¹⁶O reaction

Energy resolution of Compton electrons in LaCl3:Ce using compact digitizer

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Characterization of a 2 × 2 array of large square bars of LaBr3:Ce detectors with γ-rays up to 22.5 MeV

Cited by 10 publications

References 37 publications

A New Method to Reconstruct in 3D the Emission Position of the Prompt Gamma Rays following Proton Beam Irradiation

A New Method to Reconstruct in 3D the Emission Position of the Prompt Gamma Rays following Proton Beam Irradiation

Measurement of proton induced absolute production cross-section of 6.13, 6.92 and 7.12 MeV γ-rays from 16O(p,p ′γ )16O reaction

Energy resolution of Compton electrons in LaCl3:Ce using compact digitizer

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Measurement of proton induced absolute production cross-section of 6.13, 6.92 and 7.12 MeV γ-rays from ¹⁶O(p,p ′γ )¹⁶O reaction