Plasma source chamber for a spectrometer

A plasma source chamber for use in a spectrometer, the plasma source chamber comprising:

• an inner housing for accommodating a plasma source, and
• an outer housing accommodating the inner housing,
• wherein the outer housing comprises at least one outer air inlet opening in a first wall and at least one outer air outlet opening in a second wall,
• wherein walls of the inner housing and walls of the outer housing define a spacing so as to allow a first air flow from the at least one outer air inlet opening to the at least one outer air outlet opening through the spacing between the inner housing and the outer housing, and
• wherein the inner housing comprises at least one inner air inlet opening in a first wall and at least one inner air outlet opening in a second wall to allow a second air flow from the at least one inner air inlet opening to the at least one inner air outlet opening through the inner housing.