Hydrogen gas is considered "transparent" to gamma rays due to its low atomic mass and density, resulting in minimal interaction and attenuation of gamma radiation compared to denser materials like water or lead. This transparency means that gamma rays do not significantly heat hydrogen gas. In contrast, if hydrogen were liquefied and pressurized, it would attenuate gamma rays more, but still less than water. The discussion also raises the question of whether xenon gas shares similar properties regarding gamma ray transparency, though its higher atomic mass may lead to different interactions. Overall, the interaction of gamma rays with gases depends on the atomic mass and density of the substance.
