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Absolute measurements of neutron flux are an essential prerequisite ofneutron-induced cross section measurements, neutron beam lines characterizationand dosimetric investigations. A new gaseous detector has been developed formeasurements of 0.2 to 2 MeV neutron flux based on proton-recoil process. Thedetector, consisting of two segmented ionization chambers read by Micromegastechnology, has beed conceived to provide quasi-absolute neutron fluxmeasurements with an accuracy of \simeq3%. The gas pressure flexibility makesthe telescope non sensitive to {\gamma} and electrons background, and thereforeadvantageous over semi-conductor materials as a neutron flux instrument. Theadjustable gas pressure and H-sample thickness, the use of Micromegastechnology and the tracking capabilities allows the detection of neutrons on alarge dynamical range and down to 200 keV with a good rejection of scatteredneutron events and random background

A new gas-based proton-recoil telescope for quasi-absolute neutron flux measurements between 0.2 and 2 MeV neutron energy