The importance of managing the exposure to radiation for radiological technologist is becoming moreconspicuous as modern medical care increases the number of hospital exams involving radiation and as workof radiological technologists expand and increase in areas using advanced medical equipment for diagnosisand treatment purposes involving radiation. Measurements for individual exposure dose to radiation candiffer according to the equipment and facilities in the work environment and the average number ofexposures an individual is involved in. Therefore, systematic and reasonable controls on the exposure doseto radiation can be attained from core data. Shallow dose/Deep dose measurements were taken accordingto the year of the measurement, the technologist’s occupation post, gender, department, and age over afive year period from January 1, 2003 to December 31, 2007 using a sample of radiological technologistsfrom ten general hospitals throughout S. Korea. When comparing individual exposure dose of eachradiological technologist, there was no significant difference in the mean exposure dose according to theyear the measurement was taken (p>0.05). Mean exposure dose for Deep/Shallow according to gendershowed that men received significantly higher exposure dose than women (p<0.001). Mean exposure dosefor Deep/Shallow according to age showed an increase in exposure dose as age decreases; however, it wasnot statistically significant (p>0.05). According to occupation post, technologists working in nuclear medicinereceived significantly higher dose than other occupation posts (p<0.001). The results of individual exposuredose were under the dose limits in accordance to all nuclear regulations. Furthermore, since stochasticeffects may occur with long-term exposure to low level radiation, individual exposure dose data wasthoroughly managed and the principle of As Low as Reasonably Achievable (ALARA) was implemented whenestablishing the design of this study.