Boron Neutron Capture Therapy (BNCT) is an innovative and highly selective treatment against cancer. Nowadays, in vivo boron dosimetry is an important method to carry out such therapy in clinical ...environments. In this work, different imaging methods were tested for dosimetry and tumor monitoring in BNCT based on a Compton camera detector. A dedicated dataset was generated through Monte Carlo tools to study the imaging capabilities. We first applied the Maximum Likelihood Expectation Maximization (MLEM) iterative method to study dosimetry tomography. As well, two methods based on morphological filtering and deep learning techniques with Convolutional Neural Networks (CNN), respectively, were studied for tumor monitoring. Furthermore, clinical aspects such as the dependence on the boron concentration ratio in image reconstruction and the stretching effect along the detector position axis were analyzed. A simulated spherical gamma source was studied in several conditions (different detector distances and boron concentration ratios) using MLEM. This approach proved the possibility of monitoring the boron dose. Tumor monitoring using the CNN method shows promising results that could be enhanced by increasing the training dataset.
Characterization of a innovative RPC prototype with 1.0 mm of gas gap thickness Ramos, Dayron; Pugliese, Gabriella; Iaselli, Giuseppe ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
October 2023, 2023-10-00, Letnik:
1055
Journal Article
Recenzirano
Resistive Plate Chambers (RPCs) are gaseous detectors with high performance, robustness, and construction simplicity used for many years in HEP experiments. In this work, prototypes with 1.0 mm gas ...gap thickness and 1.43 mm HPL electrode thickness, are characterized. The prototypes were tested under a muon beam and different intensities of gamma background radiation at GIF++ to measure the muon efficiency, muon cluster size, and time resolution among other performance features related to the 1.0 mm-gap thickness. As well, the last section reports the results of the detector response using eco-friendly gas mixtures based on HFO (R1234-ze) and CO2.
Glass multi-gap RPCs for photon-transmission imaging Lee, Kyong Sei; Kang, Minho; Jo, Youngmin ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
July 2023, 2023-07-00, Letnik:
1052
Journal Article
Recenzirano
In the present R&D, multi-gap resistive plate chambers (MRPCs) are studied for photon non-destructive inspection of small airport baggages and cargos. Six-gap RPCs for line-scan operations are ...constructed with soda-lime glass with a thicknesses of 0.53 mm. The typical detector characteristics such as the operation high voltage (HV), the efficiency, and the strip multiplicity are measured by using 661.7 keV photons emitted from a 137Cs source with a current activity of 4.74 GBq. The efficiency for the 661.7 keV photons measured by the MRPC detector at the HV applied to obtain the photon-transmission images is 5.5%, which is about 84% of that predicted by a GEANT simulation. To demonstrate the quality operation of the MRPC detectors, we conduct line-scan operations for various objects and produce the photon-transmission images that barely identify 2 mm-thick stainless steel objects when measured with a color depth (contrast) of the image pixels of about 100.
A novel version of the front-end electronics for the CMS Resistive Plate Chambers is described. It is based on a new front-end ASIC, designed and manufactured in the
0.8
μm
BiCMOS technology by ...Austria Mikro Systeme. The main improvements with respect to the previous version (Loddo et al., Proceedings of the Fourth International Workshop on Resistive Plate Chambers and related Detectors, Napoli, 15–16 October 1997)
1 concern the input impedance, the threshold uniformity and the timing performance. Simulation and test results will be shown, together with a brief description of the automatic test system for both front-end chip and board.
RPC γ sensitivity simulation Altieri, S; Belli, G; Bruno, G ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2000, Letnik:
456, Številka:
1
Journal Article
Recenzirano
A method to simulate the Resistive Plate Chambers (RPCs) γ sensitivity has been developed using a Monte Carlo code. The sensitivity has been evaluated as a function of the γ energy in the range ...0.1–100 MeV and for different spectra. To evaluate the response of the detector in a Large Hadron Collider (LHC) background environment the γ energy spectrum expected in the CMS muon barrel has been taken into account and the RPC γ sensitivity evaluated as a function of the detector size.
Simulation of Resistive Plate Chamber sensitivity to neutrons Altieri, S.; Belli, G.; Bruno, G. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2001, Letnik:
461, Številka:
1
Journal Article
Recenzirano
The Resistive Plate Chambers (RPCs) sensitivity to neutrons has been simulated using GEANT code with MICAP and FLUKA interfaces. The calculations have been performed as a function of the neutrons ...energy in the range 0.02
eV–1
GeV. To evaluate the response of the detector in the LHC background environment, the neutron energy spectrum expected in the CMS muon barrel has been taken into account; a hit rate due to neutrons of about 0.6 Hz cm
−2 has been estimated for a
250×250
cm
2
RPC in the RB1 station.
Resistive Plate Chambers were tested in a muon and pion beam to study the performances at different running conditions. Results on a first chamber built without the linseed oil treatment of the ...bakelite surfaces are presented together with an evaluation of the local effects due to the spacers. These results are extrapolated to the conditions expected at LHC.
We report on recent progress in the design of the proposed MATHUSLA Long Lived Particle (LLP) detector for the HL-LHC, updating the information in the original Letter of Intent (LoI), see ...CDS:LHCC-I-031, arXiv:1811.00927. A suitable site has been identified at LHC Point 5 that is closer to the CMS Interaction Point (IP) than assumed in the LoI. The decay volume has been increased from 20 m to 25 m in height. Engineering studies have been made in order to locate much of the decay volume below ground, bringing the detector even closer to the IP. With these changes, a 100 m x 100 m detector has the same physics reach for large c\(\tau\) as the 200 m x 200 m detector described in the LoI and other studies. The performance for small c\(\tau\) is improved because of the proximity to the IP. Detector technology has also evolved while retaining the strip-like sensor geometry in Resistive Plate Chambers (RPC) described in the LoI. The present design uses extruded scintillator bars read out using wavelength shifting fibers and silicon photomultipliers (SiPM). Operations will be simpler and more robust with much lower operating voltages and without the use of greenhouse gases. Manufacturing is straightforward and should result in cost savings. Understanding of backgrounds has also significantly advanced, thanks to new simulation studies and measurements taken at the MATHUSLA test stand operating above ATLAS in 2018. We discuss next steps for the MATHUSLA collaboration, and identify areas where new members can make particularly important contributions.
In this paper, we describe a dedicated test to study possible long-term aging effects on Resistive Plate Chambers (RPCs). A double gap detector was operated under gamma irradiation for a period ...approximately equal to 10 years of LHC in the CMS-barrel region: an integrated dose of about
1.6
Gy
and a total charge of about
0.05
C/
cm
2
gap were accumulated on the chamber. The results show no relevant aging effect. Also the RPC sensitivity to
60
Co
gamma energies is measured.
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