Calibration of response curves for X-ray film
A calibration method of absolute response for TianjinⅢ X-ray film on Beijing Synchrotron Radiation Facility was introduced.In experiment,a shutter and standard detector were used to control the exposure time and integrated light intensity,hence the absolute light intensity recorded by the film could be obtained,and optical density was obtained by scanning the film with densitometer.In data processing,the shutter response was calibrated and the non-homogeneous source distribution was studied,which could reduce the uncertainty of light intensity.The experimental data of the absolute response between absolute light intensity and the optical density at photo energy of 1keV and 1.5keV were obtained respectively,the experimental results were fitted with Henke's theoretic formula to obtain absolute response curves.