Author/Authors :
Andersen، نويسنده , , K. and Bigault، نويسنده , , T. and Birch، نويسنده , , J. and Buffet، نويسنده , , J.C and Correa-Robles، نويسنده , , J. and Hall-Wilton، نويسنده , , R. and Hultman، نويسنده , , L. and Hِglund، نويسنده , , C. and Guérard، نويسنده , , B. and Jensen، نويسنده , , J. and Khaplanov، نويسنده , , A. and Kirstein، نويسنده , , O. and Piscitelli، نويسنده , , F. and Van Esch، نويسنده , , P. and Vettier، نويسنده , , C.، نويسنده ,
Abstract :
3He was a popular material in neutrons detectors until its availability dropped drastically in 2008. The development of techniques based on alternative convertors is now of high priority for neutron research institutes. Thin films of 10B or 10B4C have been used in gas proportional counters to detect neutrons, but until now, only for small or medium sensitive area. We present here the multi-grid design, introduced at the ILL and developed in collaboration with ESS for LAN (large area neutron) detectors. Typically thirty 10B4C films of 1 μm thickness are used to convert neutrons into ionizing particles which are subsequently detected in a proportional gas counter. The principle and the fabrication of the multi-grid are described and some preliminary results obtained with a prototype of 200 cm×8 cm are reported; a detection efficiency of 48% has been measured at 2.5 Å with a monochromatic neutron beam line, showing the good potential of this new technique.
