A simple gas transport system is described. Air is used as medium to take out gas radioactivities through a capillary to the gas collecting chamber. Then they are measured by a Ge(Li) detector. The system combining with a γ-ray multispectra analysis technique is used to study γ-ray energies

relative intencities and half lifetimes of gas radioisotopes produced by nuclear reaction.

From γ-ray multispectra of

23

Ne isotope produced by reaction

23

Na(n

p)

23

Ne

the half-life of 37.3±0.7 s and γ-ray energies of

23

Ne were determined. The results are well consistent with the values given in literatures.