X-ray Induced Electric Currents in Anodized Ta2O5: Towards a Large-Area Thin-Film Sensor
Davide Brivio, Matt Gagne, Erica Freund, Erno Sajo, Piotr Zygmanski
TL;DR
This paper explores using anodized tantalum as a self-powered X-ray sensor for medical, security, and space applications.
Contribution
The study demonstrates large transient currents in anodized tantalum under X-ray irradiation, suggesting its potential for large-area sensors.
Findings
Large transient currents (up to 50 nA) were observed in Ta2O5 capacitors under X-ray irradiation.
Signal strength increases with thicker capacitor oxide and is detectable even at zero external voltage bias.
Nano-porous and flat Ta capacitors show similar current–voltage characteristics when adjusted for X-ray attenuation.
Abstract
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…
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Taxonomy
TopicsAccounting and Financial Management · Business, Innovation, and Economy · Occupational Health and Safety in Workplaces