M Roziq, T. B. Indrato, and M. Ridha Mak’ruf. “Analysis of X-Ray Beams Irradiation Accuracy Using Collimation Test Tools As Well As Illumination Measurement on the Collimator to the Radiographic X-Ray Machine Conformity Test Results”. Journal of Electronics, Electromedical Engineering, and Medical Informatics, Vol. 4, no. 2, Apr. 2022, pp. 109-14, doi:10.35882/jeeemi.v4i2.8.