We have compared the high resolution BGO detector blocks from the EXACT HR PET system which use two dual-cathode rectangular photomultiplier (PM) tubes with a new block design, the EXACT HR PLUS, which uses four round PM tubes. Despite the lower coupling area between photocathode and scintillator, the HR PLUS block compares favorably with the HR block. The energy resolution averages 20% for the...

Retinal oximetry offers potential for noninvasive assessment of central venous oxyhemoglobin saturation (SO(2)) via the retinal vessels but requires a calibrated accuracy of ±3% saturation in order to be clinically useful. Prior oximeter designs have been hampered by poor saturation calibration accuracy. We demonstrate that the blue-green oximetry (BGO) technique can provide accuracy within ±3%...

A fast, effective calibration technique has been developed for future Superconducting Supercollider (SSC) calorimeters based upon the radiative capture of protons from a pulsed Radio Frequency Quadrupole (RFQ) accelerator in a fluoride target . The intense flux of low energy photons acts as a clean "pulse generator" calibration signal equivalent to 20 GeV or more . This calibration technique ha...

A new lubricating coating with functionalized graphene oxide (fGO) consisting of (GO) different oxidation degrees, n-octylamine basal plane GO (bGO), and edge (eGO) was developed or without 3-aminopropyltrimethoxysilane (APTMS) to reduce friction in macroscale contact water. The optimal preparation condition the obtained by single factor evaluation a series factors (20 % APTMS aqueous solution,...

Bi 4 Ge 3 O 12 (bismuth germanate – BGO) single crystals were produced by the Czochralski technique and their electrical and dielectric properties were investigated by impedance spectroscopy. The isothermal ac measurements were performed for temperatures from room temperature up to 750 °C, but only the data taken above 500 °C presented a complete semicircle in the complex impedance diagrams. Ex...

We present the design and analysis of a new gamma ray spectrometer for planetary science that uses an array of CdZnTe detectors to achieve the detection efficiency needed for orbital measurements. The use of CdZnTe will provide significantly improved pulse height resolution relative to scintillation-based detectors, with commensurate improvement in the accuracy of elemental abundances determine...

Abstract Bismuth germanium oxide (Bi 4 Ge 3 O 12 , BGO) scintillation crystals are widely used as detectors in the fields of particle physics and astrophysics due to their high density, thus higher efficiency for gamma-ray detection. Owing good chemical stability, they can be any environment. For rare-event searches, such dark matter coherent elastic neutrino-nucleus scattering, BGO essential c...

Technological Educational Institute of Athens, Greece Traditionally, most clinical and preclinical PET scanners, rely on full cylindrical geometry for whole body as well as dedicated organ scans, which is not optimized with regards to sensitivity and resolution. Several groups proposed the construction of dedicated PET inserts for MR scanners, rather than the construction of new integrated PET/...