Two dimension detectors for thermal and cold neutrons with sizes 120x120 mm and 380x380 mm with active layer of solid boron-10

Two dimension slow neutron detector on base of gaseous chamber with active boron-10 layer of area (120 · 120) mm2 is created and many boron-10 layer detector of area (380 · 380) mm2 is proposed. Effect to background ratio is less than 10-5. Experimental pulse height resolution is equal 15 %, position resolution is approximately 2.5 mm. Efficiency for detector of ten boron-10 layers is evaluated as 41 % ( λ ~1.82 Å) and 62 % ( λ ~8 Å).