A low-cost small-size commercial PIN photodiode
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Radiation Physics and Chemistry
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Silicon PIN (p-type-intrinsic-n-type) photodiodes are well suited as particle detectors. Here the interest is on a
low-cost solution by repurposing a commercial device meant to be used as a light sensor. The intended application
is to measure the energy spectra of electrons scattered by thin metallic foils covering small angles close to
the beam of the accelerator. The main requirements for a suitable device are: 1) a low-cost solution to allow
frequent replacements; 2) a small size to avoid as much as possible an unused area that contributes with unnecessary
capacitance; 3) a good energy resolution; and 4) an easy repurposing as a charged-particle detector.
The photodiode type BPX 65 manufactured by Osram® fulfils well these requirements. Four samples of these
commercial devices have been electrically characterised with respect to reverse current and depleted-region
capacitance. At the selected working point of 18 V, comfortably below the maximum rating of 20 V recommended
by the manufacturer for continuous operation, the total thickness of the depleted and intrinsic
regions is estimated to be (60 ± 3) μm. For the four samples considered, the measured reverse currents for a
reverse bias of 18 V are around 0.1 nA, well below the typical value specified by the manufacturer (1 nA). To
evaluate the performance of the device as a detector, energy spectra have been acquired for γ-rays with energies
from 10 to 140 keV using 241Am, 133Ba, and 57Co radioactive sources. The resolution of the BPX 65 encountered
with the γ-rays emitted by 241Am at 59.5-keV is 2.5 keV (FWHM - Full Width at Half Maximum), which is close
to the value obtained with a pulser, showing that its main limitation is the electronic chain employed in the
setup. The response function to monoenergetic electrons in the same energy range is studied in the companion
paper.
Como referenciar
MALAFRONTE, A.A.; PETRI, A.R.; GONCALVES, J.A.C.; BARROS, S.F.; BUENO, C.C.; MAIDANA, N.L.; MANGIAROTTI, A.; MARTINS, M.N.; QUIVY, A.A.; VANIN, V.R. A low-cost small-size commercial PIN photodiode: I. Electrical characterisation and low-energy photon spectrometry. Radiation Physics and Chemistry, v. 179, p. 1-11, 2021. DOI: 10.1016/j.radphyschem.2020.109103. Disponível em: http://200.136.52.105/handle/123456789/31604. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.