A thermal neutron beam monitor based on avalanche counter

A simple neutron beam monitor based on the combination of a low-pressure position-sensitive avalanche counter with a 6Li neutron converter has been developed. The details of the construction of the device, as well as, the results of the test of the device with a thermal neutron beam are described. The main features of the neutron beam monitor are high count-rate capability, low γ-sensitivity, low perturbation on neutron beams and a position sensitivity of ∼2 mm.

► The suitability of an avalanche counter for neutron beam monitoring is described.
► The technical design of the beam monitor is presented.
► The results of the test of the device are shown.