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Characterization of the Percival detector with soft X-rays.

ABSTRACT: In this paper the back-side-illuminated Percival 2-Megapixel (P2M) detector is presented, along with its characterization by means of optical and X-ray photons. For the first time, the response of the system to soft X-rays (250?eV to 1?keV) is presented. The main performance parameters of the first detector are measured, assessing the capabilities in terms of noise, dynamic range and single-photon discrimination capability. Present limitations and coming improvements are discussed.

SUBMITTER: Marras A

PROVIDER: S-EPMC7842225 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Characterization of the Percival detector with soft X-rays.

Marras Alessandro A Correa Jonathan J Lange Sabine S Vardanyan Vahagn V Gerhardt Tim T Kuhn Manuela M Krivan Frantisek F Shevyakov Igor I Zimmer Manfred M Hoesch Moritz M Bagschik Kai K Scholz Frank F Guerrini Nicola N Marsh Ben B Sedgwick Iain I Cautero Giuseppe G Giuressi Dario D Iztok Gregori G Menk Ralf H RH Scarcia Martin M Stebel Luigi L Nicholls Tim T Nichols William W Pedersen Ulrik K UK Shikhaliev Polad P Tartoni Nicola N Hyun HyoJung H Kim SeongHan S Kim KyungSook K Rah SeungYu S Dawiec Arkadiusz A Orsini Fabienne F Pinaroli Giovanni G Greer Alan A Aplin Steve S Jewell April D AD Jones Todd J TJ Nikzad Shouleh S Hoenk Michael E ME Okrent Frank F Graafsma Heinz H Wunderer Cornelia B CB

Journal of synchrotron radiation 20210101 Pt 1

In this paper the back-side-illuminated Percival 2-Megapixel (P2M) detector is presented, along with its characterization by means of optical and X-ray photons. For the first time, the response of the system to soft X-rays (250 eV to 1 keV) is presented. The main performance parameters of the first detector are measured, assessing the capabilities in terms of noise, dynamic range and single-photon discrimination capability. Present limitations and coming improvements are discussed. ...[more]

PMID: 33399562

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Project description:PurposeDosimetric properties of the new microSilicon diode detector (60023) have been studied with focus on application in small-field dosimetry. The influences of the dimensions of the sensitive volume and the density of the epoxy layer surrounding the silicon chip of microSilicon have been quantified and compared to its predecessor (Diode E 60017) and the microDiamond (60019, all PTW-Freiburg, Germany).MethodsDose linearity has been studied in the range from 0.01 to 8.55 Gy and dose-per-pulse dependence from 0.13 to 0.86 mGy/pulse. The effective point of measurement (EPOM) was determined by comparing measured percentage depth dose curves with a reference curve (Roos chamber). Output ratios were measured for nominal field sizes from 0.5 × 0.5 cm2 to 4 × 4 cm2 . The corresponding small-field output correction factors, k, were derived with a plastic scintillation detector as reference. The lateral dose-response function, K(x), was determined using a slit beam geometry.ResultsMicroSilicon shows linear dose response (R2 = 1.000) in both low and high dose range up to 8.55 Gy with deviations of only up to 1% within the dose-per-pulse values investigated. The EPOM was found to lie (0.7 ± 0.2) mm below the front detector's surface. The derived k for microSilicon (0.960 at seff = 0.55 cm) is similar to that of microDiamond (0.956), while Diode E requires larger corrections (0.929). This improved behavior of microSilicon in small-fields is reflected in the slightly wider K(x) compared to Diode E. Furthermore, the amplitude of the negative values in K(x) at the borders of the sensitive volume has been reduced.ConclusionsCompared to its predecessor, microSilicon shows improved dosimetric behavior with higher sensitivity and smaller dose-per-pulse dependence. Profile measurements demonstrated that microSilicon causes less perturbation in off-axis measurements. It is especially suitable for the applications in small-field output factors and profile measurements.

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Characterization of the Percival detector with soft X-rays.

Publications

Characterization of the Percival detector with soft X-rays.

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