Worker Exceeded Annual Whole Body Dose Limit

Print View Posted on: 21 February 2023

Event Date: 30 September 2022 Event Type: Other
Event Location: United States of America, Waukegan, IL / Vista Medical Center East INES Rating: 2 (Final)

A nuclear medicine technologist received a whole body dose of approximately 0.113 Sv (11.3 rem) over the third quarter of 2022. The last seven years of dosimetry for this employee consistently show total annual occupational exposures at or near 10% of the annual limits. Employee’s job duties did not change during the reported period. Inspectors conducted a reactionary inspection on January 9, 2023. No additional information to support the licensee's claims that the exposure was not valid was obtained during the inspection or through additional documentation provided to the State. Contamination seems unlikely as the dosimeters are screened for gamma radiation upon intake. The processor believes the badges were exposed to angular, shielded, or collimated radiation. Re-analysis supported the exposure reports. The licensee was cited for failing to report timely, failing to limit occupational doses to 0.05 Sv (5 rem), failing to restrict the employee's additional occupational exposures for the remainder of the year, and failure of the Radiation Safety Officer to initiate timely investigation. The dose to the nuclear medicine technologist exceeded the U.S. regulatory limit for the annual whole body dose of 0.05 Sv (5 rem). EN56300

INES Rating: 2 - Incident (Final) as per 17 February 2023
Release beyond authorized limits? No
Overexposure of a member of the public? No
Overexposure of a worker? Yes

Contamination spread within the facility? No
Damage to radiological barriers (incl. fuel damage) within the facility? No

Degradation of Defence In-Depth No

Person injured physically or casualty? No
Is there a continuing problem? No

Todd Smith
Nuclear Regulatory Commission (NRC)
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