We got the following results from the experiment and examination in order to measure the bone-marrow dose of the patients when we did chest or abdomen radiography in the hospitals located in Seoul City from Jan. 1989 until Feb. 1990. 1. In the exposure factors for chest radiography, tube voltage $60{sim}69;kVp$ took 48.3%, $80{sim}89;or;90{sim}99;kVp$ took 13.8% respectively, $70{sim}79;kVp$ 10.3% and $100{sim}129;kVp$ 10.3%. In tube current and exposure times, $6{sim}10;mAs$ took 41.4%, $16{sim}20;mAs$ took 20.7% and $11{sim}15;mAs$ 13.8%, measure under 5mAs 10.4% orderly. 2. In chest radiography, the bone-marrow dose came to the minimum 3.48 mrad, to the maximum 35.67 mrad, to the mean 14.46 mrad, to the standard deviation 8.89 mrad. 3. Comparing bone-marrow doses of the patients when we used Bucky technique and non-Bucky technique, that of Bucky technique was very higher than that of non-Bucky technique. Because the result was that Bucky technique had the span of $6.09{sim}35.67$ mrad, while non-Bucky technique had the span of $3.48{sim}17.40$ mrad. 4. In the exposure factors for abdomen radiography, tube voltage of $70{sim}79;kVp$ was 63.0%, that of $80{sim}89;kVp$ was 22.2%, that of $60{sim}69;kVp$ was 11.1 %. Tube current and exposure times of $31{sim}40;kVp$ was 33.4%, that of $51{sim}60;mAs$ was 29.6% and that of $41{sim}50;mAs$ was 22.2%. 5. In abdomen radiography, the bone-marrow dose of the patients came to the minimum of 6.96 mrad, to the maximum of 60.90 mrad, to the mean of 35.73mrad, to the standard deviation of 12.65 mrad.