Timeline of the U.S. Radiologic Technologists Study

  • Study Began


    Key Goal: To understand how repeated low-dose occupational ionizing radiation exposures are related to cancer and other health conditions.

    Study identifies current and former radiologic technologists ARRT certified for at least two years from 1926-1982. Ultimately 146,022 technologists enrolled (106,958 women and 39,064 men).

  • First Survey



    90,305 (68%) technologists complete questionnaire. Additional 14,199 respond to shorter telephone survey.

  • Second Survey



    90,972 (72%) technologists complete questionnaire.

  • Genetic Studies Begin

    Goal: To better understand the role of genetics in cancer, alone or in conjunction with radiation.

    Approximately 10,000 blood samples, 900 saliva samples collected.

  • Third Survey



    73,625 (72%) technologists complete questionnaire, including 2,744 who worked before 1950 and completed a telephone survey.

  • Fourth Survey



    58,484 (62%) technologists complete fourth survey questionnaire, 14,647 complete fluoroscopically-guided procedures questionnaire, and 6,222 complete nuclear medicine procedures questionnaire.

  • During 2015 and ongoing



    1. Conduct analyses of occupational radiation exposure and risk of specific cancers
    2. Conduct analyses of work history and cancer risk analyses of USRT Cohort members who perform nuclear medicine procedures and fluoroscopically guided procedures
    3. Evaluate risk of cataracts in the entire USRT cohort and in technologists who perform nuclear medicine procedures and fluoroscopically guided procedures
    4. Evaluate measures for estimating lifetime exposures to ultraviolet radiation and conduct exposure response analyses of cancer and other serious disease risks in relation to estimated lifetime ultraviolet radiation exposure