Abstract
The characteristic curve for mass spectrum have been studied.The characteristic curve was effected by the optical system of the microphotometer.Long linear density region of the characteristic curve was got by the microphotometer with the narrow effective width of illumination area. On intensity scale, use of the isotope abundance ratio was better than use of the monitor current.The smooth characteristic curve was given by the two step method. γand linear density region of Ilford Q-2 plate for platinum mass spectrum were following; γ=0.8-0.9, D=0.4-1.0.
The characteristic curve for mass spectrum was similar to one for radiant spectrum at 1, 500Å region.
