  An ionization chamber with gaseous samples has been designed. It has been
tested on the beam of the pulsed reactor IBR-30 of FLNP, JINR-Dubna. The
experiment has been carried out with resonance neutrons. The exposed gas volume
serves as a target for neutron beam. We have compared the chamber to samples on
substrates, the background component due to Li and B microimpurities in this
case is totally absent. It has been tested also the recovery capability of the
chamber after the reactor power pulse using the protons from the 3He(n,p)3H
reaction, alpha-particles from a U-source and a pulsed precision generator.
Moreover the energy resolution of the chamber with its equipment has been
carried out.
