Radiation characterisation for new tantalum polymer capacitors

Martin, Patrick Donald; Lopez-Calle, I.; Muñoz, Eduardo Ugarte; Domínguez, M.; Morales, Miguel; Nunez, David; Lacombe, Donald J.; Morilla, Yolanda; Mota, Carlos; Pedroso, Joana

doi:10.1109/radecs.2016.8093218

Cited by 3 publications

(1 citation statement)

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“…Radiation-induced conductivity (RIC, σ RIC ) in insulators depends on the type of charge carriers created by ionization and their respective modes of transport with recombination, trapping and formation of space charge regions. Typically, RIC is proportional to dose rate γ (σ RIC = k RIC γ Δ ) and to a material-dependent constant, k RIC , Δ [ 12 , 13 ]. It must be noted that Ta 2 O 5 is a high-atomic number (high-Z) and high-density insulator with fairly small band gap (~4 eV), and it has large photoelectric absorption and Compton scattering cross sections.…”

Section: Introductionmentioning

confidence: 99%

X-ray Induced Electric Currents in Anodized Ta2O5: Towards a Large-Area Thin-Film Sensor

Brivio,

Gagne,

Freund

et al. 2024

Sensors

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Purpose: We investigated the characteristics of radiation-induced current in nano-porous pellet and thin-film anodized tantalum exposed to kVp X-ray beams. We aim at developing a large area (≫cm2) thin-film radiation sensor for medical, national security and space applications. Methods: Large area (few cm2) micro-thin Ta foils were anodized and coated with a counter electrode made of conductive polymer. In addition, several types of commercial electrolytic porous tantalum capacitors were assembled and prepared for irradiation with kVp X-rays. We measured dark current (leakage) as well as transient radiation-induced currents as a function of external voltage bias. Results: Large transient currents (up to 50 nA) under X-ray irradiation (dose rate of about 3 cGy/s) were measured in Ta2O5 capacitors. Small nano-porous Ta and large-area flat Ta foil capacitors show similar current–voltage characteristic curve after accounting for different X-ray attenuation in capacitor geometry. The signal is larger for thicker capacitor oxide. A non-negligible signal for null external voltage bias is observed, which is explained by fast electron production in Ta foils. Conclusions: Anodized tantalum is a promising material for use in large-area, self-powered radiation sensors for X-ray detection and for energy harvesting.

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Section: Introductionmentioning

confidence: 99%