Overexposure to Radiographer

Print View Posted on: 19 April 2019

Event Date: 11 April 2019 Event Type: Radiation Source
Event Location: United States of America, Alabaster, Alabama / Vital Inspection Professional INES Rating: 2 (Final)

A radiographer working in the permanent shooting room at one of the licensee’s facilities, cranked out a 2.48 TBq (67 Ci) Ir-192 source for an exposure and did not crank the source back into the exposure device before setting up for the next exposure. Upon badge processing, it was determined that the radiographer received an exposure of 81.49 mSV (8.149 rem). The calculated exposures to the left hand and right hand were 396.84 mSv (39.684 rem) and 93.38 mSv (9.338 rem), respectively. The radiographer is being monitored by a medical physician. The primary cause of the incident appears to be human error. In addition to not cranking the source back at the end of the exposure, the radiographer failed to observe the radiation actuated visible alarm; bypassed the audible alarm feature of the shooting room; and failed to observe his survey meter upon entry into the shooting room. All safety features were operating properly at the time of the incident. The dose received by the radiographer exceeds the U.S. statutory limit for whole body dose of 0.05 Sv (5 rem). NRC EN53994

INES Rating: 2 - Incident (Final) as per 17 April 2019
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

Patricia Milligan
Nuclear Regulatory Commission (NRC)

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