  Basic R & D have been carried out with one small straw tube detector
prototype with premixed gas of Ar+CO2 in 70:30 and 90:10 ratio. The gain and
the energy resolution are measured with Fe55 X-ray source. Effect of
temperature and pressure on these parameters are measured. The variation of
gain and energy resolution with rate per unit length are also measured. The
details of the test set-up, the method of measurement and the test results are
presented in this paper.
