1. bbbbb 1.Introduction to ET Enterprises Ltd 2.Brief History 3.Product Range 4.Main Applications 5.Recent Developments 6.Current and Past projects 7.Summary of Capability VLVnT08 – Toulon April 2008

2. bbbbb ET Enterprises Limited Bury street Ruislip HA4 7TA United Kingdom phone: +44 (0)1895 630773 fax: +44 (0)1895 631774 web: http://www.et-enterprises.com e-mail: info@electron-tubes.co.uk Introduction to ET Enterprises Ltd VLVnT08 – Toulon April 2008

3. bbbbb ET Enterprises Limited is a newly formed company which has taken over the photomultiplier and accessories business of Electron Tubes Limited and will continue to manufacture, supply and develop the Electron Tubes brand product range. Introduction to ET Enterprises Ltd VLVnT08 – Toulon April 2008

4. rrrrrrrrrrrrrrrrrrrrrrbbbbb Ludlum Instruments Inc. Sweetwater, Texas ADIT Pmts Sweetwater ET Enterprises Ruislip UK ELJEN Sweetwater Introduction to ET Enterprises Ltd VLVnT08 – Toulon April 2008

5. bbbbb ET Enterprises will benefit from the additional volume production facilities of ADIT. The more specialised pmts will continue to be made in the UK at the same location as our Development facility. Introduction to ET Enterprises Ltd VLVnT08 – Toulon April 2008

6. rrrrrrrrrrrrrrrrrrrrrrbbbbb Introduction to ET Enterprises Ltd Combined resources of the two operations will enable the new company to extend its penetration into higher volume, lower cost markets Benefit from ET Enterprises’ knowledge and experience in many different photomultiplier applications worldwide. VLVnT08 – Toulon April 2008

7. rrrrrrrrrrrrrrrrrrrrrrbbbbb Brief History As EMI Electron Tubes Ltd: 1940s:First pmt photon counting system 1970s:First large hemispherical pmt (5 inch) As Thorn EMI Electron Tubes Ltd 1980s:First low background glass pmts Rugged pmts for space applications 1990s: First small (1 inch) hemispherical pmts First ultra-low background glass pmts VLVnT08 – Toulon April 2008

8. rrrrrrrrrrrrrrrrrrrrrrbbbbb Brief History As Electron Tubes Ltd: 1995:High performance pmt modules X-Ray detection systems 2000:Ultra -low temperature pmts 2005:Signal processing electronics ET Enterprises Ltd – from May 2007 VLVnT08 – Toulon April 2008

9. rrrrrrrrrrrrrrrrrrrrrrbbbbb Product Range Photomultipliers Voltage Dividers Housings Photon counting systems VLVnT08 – Toulon April 2008

10. rrrrrrrrrrrrrrrrrrrrrrbbbbb Product Range Diameter: 19mm to 200mm Spectral Range:110nm to 900nm Gain: 10 3 to >10 8 Rise Time: down to <2ns Window profile: various Rugged Low temperature High temperature Low background glass VLVnT08 – Toulon April 2008

11. rrrrrrrrrrrrrrrrrrrrrrbbbbb Main Applications High energy Physics Space exploration Oil exploration Nuclear radiation monitoring Bio-technology Pollution monitoring Scintillation spectrometry VLVnT08 – Toulon April 2008

12. rrrrrrrrrrrrrrrrrrrrrrbbbbb Recent Developments Ultra-low temperature photocathodes for use down to -180 C Ultra-low background glass: ~50 times lower than standard glass All Quartz construction: >200 times lower than standard glass Range of standard rugged pmts VLVnT08 – Toulon April 2008

13. rrrrrrrrrrrrrrrrrrrrrrbbbbb Recent Developments High blue/green QE combined with low dark count Electro-optical designs to optimise collection efficiency Low temperature photocathodes with UV windows Encapsulated pmts for direct immersion in liquids VLVnT08 – Toulon April 2008

14. rrrrrrrrrrrrrrrrrrrrrrbbbbb Current and Recent Projects BOREXINO 200mm hemi-spherical Collection Efficiency Encapsulated for Immersion in liquid Single electron resolution Dark count VLVnT08 – Toulon April 2008

15. rrrrrrrrrrrrrrrrrrrrrrbbbbb Current and Recent Projects WARP 78 mm domed window Timing Operation at LAr temperature Single electron resolution Dark count VLVnT08 – Toulon April 2008

16. rrrrrrrrrrrrrrrrrrrrrrbbbbb Current and Recent Projects DAMA 78 mm all quartz Collection Efficiency Fast timing Single electron resolution Dark count VLVnT08 – Toulon April 2008

17. rrrrrrrrrrrrrrrrrrrrrrbbbbb Current and Recent Projects ICARUS 200mm hemi-spherical QE and collection efficiency Operation at LAr temperature Single electron resolution Dark count VLVnT08 – Toulon April 2008

18. rrrrrrrrrrrrrrrrrrrrrrbbbbb Current and Recent Projects MAGIC 25 mm & 38 mm hemi-spherical QE and collection efficiency Fast timing Single electron resolution Low gain VLVnT08 – Toulon April 2008

19. rrrrrrrrrrrrrrrrrrrrrrbbbbb Summary of Capability Difficult environments High QE/Low background Range of window profiles Single photon electron resolution Customisation and Application support VLVnT08 – Toulon April 2008