“…An array-type PG detection system developed by Min et al [2] inspired us to develop a better one. Thanks to the development of HICAM gamma camera [3] and new high-performance scintillation detector technology for PET [4], an online pixelated prompt gamma imaging detector system (PPGID) is now possible. Figure 1 shows the system, which includes at least 2 groups of PPIGD: PPIGD1, on the upside of a PMMA target (represents the patient, (C 5 H 8 O 2 ) n , 0.95 g cm −3 ), is for longitudinal measurement of beam range and profile and PPIGD2, at the end, is for transverse measurement of beam profile.…”
Increased accuracy of proton beam delivery provides additional benefits to the patients undergo the treatment. A prompt gamma imaging detector can provide additional information during the treatment, as the prompt gammas produced by the interactions between protons and human tissues are related to the range and profile of the beam in the patient. This paper makes a Monte Carlo feasibility study for a pixelated prompt gamma imaging detector which can not only measure the proton range but also merge the beam profile and 3D beam image inside the patient. FLUKA simulation result shows that this detector can reduce background noise and measure the range and beam profile by using of grated shielding material, vertical gammas selection and a 5 MeV energy window.
“…An array-type PG detection system developed by Min et al [2] inspired us to develop a better one. Thanks to the development of HICAM gamma camera [3] and new high-performance scintillation detector technology for PET [4], an online pixelated prompt gamma imaging detector system (PPGID) is now possible. Figure 1 shows the system, which includes at least 2 groups of PPIGD: PPIGD1, on the upside of a PMMA target (represents the patient, (C 5 H 8 O 2 ) n , 0.95 g cm −3 ), is for longitudinal measurement of beam range and profile and PPIGD2, at the end, is for transverse measurement of beam profile.…”
Increased accuracy of proton beam delivery provides additional benefits to the patients undergo the treatment. A prompt gamma imaging detector can provide additional information during the treatment, as the prompt gammas produced by the interactions between protons and human tissues are related to the range and profile of the beam in the patient. This paper makes a Monte Carlo feasibility study for a pixelated prompt gamma imaging detector which can not only measure the proton range but also merge the beam profile and 3D beam image inside the patient. FLUKA simulation result shows that this detector can reduce background noise and measure the range and beam profile by using of grated shielding material, vertical gammas selection and a 5 MeV energy window.
“…Even for incoming X-rays of 25 keV, the QE is still 20% (0.2). To increase the sensitivity for X-ray energies up to several hundred keV, a scintillator can be combined with an SDD as a photo detector to measure the scintillation light of the converted gamma rays with energies up to more than 1000 keV [15]. Figure 8:Quantum efficiency of a 450 μm thick silicon detector as a function of X-ray energy from 50 eV to 25 keV.…”
Section: Long-term Stability and Reproducibilitymentioning
“…The silicon drift detectors (SDDs) [1,2], an evolution of the silicon drift chambers [3] position-sensing devices, combine the Silicon reverse bias p-n junction response to ionizing radiation with an innovative drift field design which minimizes the collecting anode area, resulting in a low-noise, high-rate capability device, suitable for precision x-ray measurements. The SDDs cover a wide range of applications [4][5][6][7][8], playing a key role in the high precision x-ray spectroscopy of light exotic atoms. In particular, the kaonic atoms spectroscopy represents a fundamental tool for probing the non-perturbative regime of quantum chromodynamics in the strangeness sector, with implications extending from particle and nuclear physics to astrophysics [9][10][11][12].…”
The current work presents the optimization of large area Silicon Drift Detectors (SDDs) developed by the SIDDHARTA-2 collaboration for high precision X-ray measurements of light exotic atom transitions. Two different radiation sources were employed in the study: an X-ray tube, for investigating the energy resolution and the charge collection efficiency of the device in the range 4000 eV - 13000 eV, and a β-
90Sr radioactive source for measuring the timing response, thus qualifying the charge drift parameters inside the semiconductor. The study reports the spectroscopic response optimization, together with the tuning of the electron dynamics for the given Silicon technology, by adjusting the applied electric field and the working temperature, which allow a good control of the device’s performances for high precision, timed X-ray spectroscopy applications.
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