(19)

(11)

EP 2 810 284 A2

(12)

(88) Date of publication A3: 26.09.2013 (43) Date of publication: 10.12.2014 Bulletin 2014/50 (21) Application number: 13703126.6 (22) Date of filing: 04.02.2013

(51) International Patent Classification (IPC):  G21F 9/00(2006.01) G21F 9/06(2006.01) C02F 1/46(2006.01) (86) International application number: PCT/GB2013/050251 (87) International publication number: WO 2013/114142 (08.08.2013 Gazette 2013/32)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 03.02.2012 GB 201201933 (71) Applicant: National Nuclear Laboratory Limited Warrington, Cheshire WA3 6AE (GB)	(72) Inventors: O'BRIEN, Luke Warrington, Cheshire WA3 6AE (GB) COLLINS, John Chester, Cheshire CH1 6EH (GB) BREWER, Steven Chester, Cheshire CH1 6EH (GB) (74) Representative: HGF Limited  Saviour House 9 St. Saviourgate York YO1 8NQ York YO1 8NQ (GB)