Dr Chris Mills

Research Fellow
+44 (0)1483 682711
18 ATI 01



Research interests

Research collaborations


Hashini M. Thirimanne, K. D. G. Imalka Jayawardena, Andrew Nisbet, Yonglong Shen, R. M. Indrachapa Bandara, Christopher A. Mills, Guosheng Shao, S. Ravi P. Silva (2020)Hybrid Multipixel Array X-Ray Detectors for Real-Time Direct Detection of Hard X-Rays, In: IEEE transactions on nuclear science67(10)pp. 2238-2245 IEEE

X-ray detectors currently employed in dosimetry suffer from a number of drawbacks including the inability to conform to curved surfaces and being limited to smaller dimensions due to available crystal sizes. In this study, a hybrid X-ray detector (HXD) has been developed which offers real-time response with added advantages of being highly sensitive over a broad energy range, mechanically flexible, relatively inexpensive, and able to be fabricated over large areas on the desired surface. The detector comprises an organic matrix embedded with high-atomic-number inorganic nanoparticles which increase the radiation attenuation and within the device allows for simultaneous transfer of electrons and holes. The HXD delivers a peak response of 14 nA cm(-2), which corresponds to a sensitivity of 30.8 mu C Gy(-1) cm(-2), under the exposure of 6-MV hard X-rays generated by a medical linear accelerator. The angular dependence of the HXD has been studied, which offers a maximum variation of 26% in the posterior versus lateral beam directions. The flexible HXD can be conformed to the human body shape and is expected to eliminate variations due to source-to-skin distance with reduced physical evaluation complexities.