Nontoxic, stable X-ray detector materials for rapid, low-dose imaging

Applications: Low-dose radiography, Precise X-ray imaging, Portable X-ray devices, Industrial non-destructive testing, Security screening systems, X-ray video

Current X-ray detector materials cannot simultaneously deliver strong absorption, low noise and efficient charge transport at very low doses rates.

Researchers developed novel bismuth oxyiodide (BiOI) single crystals as high-performance materials for detecting very low dose of X-rays, a key capability for safer and more sensitive medical and industrial radiography.

Nature Communications 2023, 14, 2452.

Features	Benefits
Low dose detection down to 22 nGy_air·s⁻¹	Reduced patient and operator radiation exposure New applications becomes feasible, such as X-ray videos
X-ray absorption (attenuation) enhanced through heavy elements bismuth and iodine, characterised for their strong X-ray stopping power	Reduction of detector thickness and system weight for compact and portable platforms
Direct conversion detection from X-rays to electrical signal	High spatial resolution and fast temporal response Simple system architecture with no need for scintillation step
Low dark current and noise	Clear detection of weak signals Lower power consumption Improved image quality
Efficient charge transport via delocalised large polarons instead of self-trapping.	Absorbed X-rays reliably turn into usable electrical signals Improved signal-to-noise ratio
Lead-free chemistry	Regulatory compatibility Safe manufacturing and disposal

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Nontoxic, stable X-ray detector materials for rapid, low-dose imaging

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