X-ray data acquisition systems for Airport Security J M Homer Electron Tubes Ltd

Electron Tubes Ltd  Specialises in X-ray and light detection systems  UK based company  Products X-ray data acquisition systems Light detection modules Photomultipliers  Customers Security systems Instrumentation NDT systems Scientific research (HE Physics and Space)

Carry-on baggage scanner Checked baggage scanner Large baggage or contain e r scanner Airport security applications

Carry-on baggage scanner Linescan system Checked baggage scanner CT system Large baggage or container scanner Multi-view linescan system System types

Personal X-ray scanning Compton backscatter using photomultipliers

MaterialThickness mm Energy Range mm Signal outputSignal decay time Silicon0.35 – 25keVHighest signal, direct conversion 1µs Gadox (Tb)140gm/cm220 – 100keVSimilar to CsI2 – 3ms CsI (Tl)4.5mm40 – 160keVBest light output 2 components, long decay tail CdWO42.5mm – 30mm 150keV – 9Mev25% of CsI20µs X-ray detectors

X-ray linescan system

Single energy and dual energy detectors

X-ray CT system

Requirements of data acquisition system  Large number of channels, 2000 to  Sub-millisecond scan time  Wide dynamic range  Digital output  Low noise  Low cost

XDAS system  charge integrating method  simultaneous data acquisition and read-out  on board sub-sampling and data summation  links to PC via USB2 or PCI-7300A data I/O card  s/w controllable via RS485 interface  system read-out rate 5MB/s

Single Channel of ASIC

XDAS module block diagram

XDAS system block diagram

XDAS V1X system  One digital board drives 20 detector head boards with 2560 channels  Multiple digital boards allow up to channels  System read-out rate up to 20MHz  Same capability as original XDAS system  Lower cost

XDAS-V1X detector head board

XDAS-V1X signal processing board block diagram

XDAS-V1X system block diagram

XDM System  modular system of any length  6mm detector pitch  suitable for use with high energy applications using Linacs  high charge capacity (1000pC)  20-bit output  1 bit of noise  high speed serial link to CPU  systems designed to order

summary  modular X-ray data acquisition systems  designed for use with linescan and CT X-ray systems large number of channels fast low noise low cost per channel  digital output  can be configured to meet specific requirements

solutions in light detection