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Service quality can be measured through patient safety, patient-focused services, effectiveness, timeliness and fairness. Radiology examination as a supporting examination supports diagnostics and treatment services. Therefore, good quality radiology services for patients are highly needed by medical staff and professionals through skills and knowledge development. The purpose of this study was to obtain empirical confirmation of how workload and radiology unit performance influence service quality, using time effectiveness as intervening variables at Tarakan Hospital. This study was a quantitative research with hypothesis testing type of research. This research was an explanatory causality research, which explains casualties on workload, employee performance, and time effectiveness towards service quality. Samples were obtained using saturated sampling techniques from a total population and sample of 43 people. The unit of analysis was the radiology unit, using time horizon group or one shot study and analyzed using Path Analysis. The results of this study were that workload, and employee performance altogether had a significant positive effect on service quality and time effectiveness as the intervening variable. The workload had a negative effect on-time effectiveness; employee performance had a significant positive effect on-time effectiveness, time effectiveness had a positive effect on service quality, the workload had a negative effect on service quality, and employee performance had a significant positive effect on service quality. The test results also showed that the effectiveness of time did not have a mediating role. The results indicated that employee performance becomes direct determinant on service quality as employees conformity in maintaining tools and equipment in handling their work has been stated clearly in the Radiology Units Standard Operating Procedures. Time effectiveness did not mediate the relationship between workload and service quality. This result confirms that should the radiology unit wish to improve its quality service, then the adjusted workload does not require improvement on time effectiveness.