On March 11, 2008, the Nebraska Division of Public Health (DPH) notified the Nuclear Regulatory Commission (NRC) that a radiographer employed by an industrial radiographer licensee may have received an occupational dose in excess of the regulatory limits. According to DPH, the event involved an AEA 660B radiographic device containing a 1.2 TBq (33 Ci) Ir-192 sealed source.
The individual involved in the potential overexposure stated that while conducting radiographic operations on March 4, 2008, he noticed that his pocket ion chamber was off-scale and believed it was the result of being bumped. The regulatory requirements require the licensee to determine whether the off-scale reading was the result of an overexposure. If an overexposure cannot be ruled out, the personal dosimeter must be sent for processing within 24 hours. The individual notified his radiation safety officer on March 7, 2008, and the dosimeter was sent for processing that day, although not within the required 24 hours. On March 10, 2008, the dosimetry provider notified the licensee that based on their analyses; the radiographer received a whole body effective dose of approximately 7.6 cSv (7.6 rem), an occupational dose in excess of the regulatory limit of 5 cSv (5 rem).
The State of Nebraska is investigating the event and the individual has been removed from working with licensed material.
Location: Team Industrial Services Event date: Tue, 04-03-2008
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