COLLIMATOR Russian patent published in 2009 - IPC G21K1/02 

FIELD: instrument engineering.

SUBSTANCE: application: for nondestructive control methods. Substance consists that a collimator comprises a truncated pyramid provided with a beam pat shaped as a lateral surface of the truncated pyramid. The smaller base of the collimator directly adjoins an outlet channel of a moderating block made of polyethylene and representing a hollow cube. Inside of the moderating block, there is a converter for a fast neuron source. The space between the converter face and internal surface of the moderating block contains the polyethylene layer that forms a cavity formation. The moderating block on its surface comprises series lead converter-reflector, a bismuth gamma-shield layer, a slow and fast neutron absorption layer. Lengthwise the collimator additionally accommodates series lead shield layer, a slow and fast neutron shield layer and gamma-shield layer. Gadolinium and cadmium interlayers are provided between shield layers.

EFFECT: higher slow neuron flux density.

3 cl, 7 dwg