In this work, we use two gas mass fraction samples of galaxy clusters obtained from their X-ray surface brightness observations jointly with recent H(z) data in a flat ΛCDM framework to impose limits on cosmic opacity. {It is assumed that the galaxy clusters are in hydrostatic equilibrium and their gas mass fraction measurement is constant with redshift.} We show that the current limits on the matter density parameter obtained from X-ray gas mass fraction test are strongly dependent on the cosmic transparency assumption even for a flat scenario. Our results are consistent with a transparent universe within 1σ c.l. in full agreement with other analyses which used type Ia supernovae, gamma ray burst and H(z) data.
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