Carbon dioxide二氧化碳 · Carbon dioxide is a fairly unreactive gas(不活泼气体) but it does react at high temperatures with certain types of steel and with graphite. Both these reactions have proved troublesome in British gas- cooled reactors in which carbon dioxide has been chosen as the coolant Its advantages are its inertness, availability and cheapness, and the very low capture cross-sections of both carbon and oxygen Carbon 13, which is very small constituent of naturally occurring carbon, captures neutrons to a very small extent to form radioactive carbon 14 which poses a minor hazard if carbon dioxide leaks or is vented(排出,通风) from a reactor to atmosphereCarbon dioxide 二氧化碳 • Carbon dioxide is a fairly unreactive gas (不活泼气体), but it does react at high temperatures with certain types of steel and with graphite. Both these reactions have proved troublesome in British gas- cooled reactors in which carbon dioxide has been chosen as the coolant. • Its advantages are its inertness, availability and cheapness, and the very low capture cross-sections of both carbon and oxygen. • Carbon 13, which is very small constituent of naturally occurring carbon, captures neutrons to a very small extent to form radioactive carbon 14 which poses a minor hazard if carbon dioxide leaks or is vented (排出，通风) from a reactor to atmosphere