Evaluating the Radiation From Accidental Exposure During a Nondestructive Testing Event.

Area of Science:

• Industrial Safety
• Radiological Health
• Nondestructive Testing (NDT)

Background:

• Industrial radiography is a key NDT method.
• A 1999 incident involved accidental exposure of two workers to an unshielded Iridium-192 (Ir-192) source.
• The exposure occurred during routine NDT operations.

Purpose of the Study:

• To investigate the health effects of acute radiation exposure on two NDT workers.
• To assess the radiation doses received by the affected individuals.
• To identify flaws in radiation safety regulations and propose improvements.

Main Methods:

• Case study of a 1999 industrial radiography accident in Taiwan.
• Analysis of radiation exposure levels and health impacts on two workers (Operator A and Operator B).
• Examination of affected organs including mammary glands, bone marrow, thyroid, eyes, and gonads.

Main Results:

• Operator A received effective doses of 6.9-18.9 Sv, experiencing severe injuries like tissue necrosis and chromosomal abnormalities.
• Operator B received effective doses of 2.5-11.5 Sv.
• Significant radiation doses were absorbed by fingers, eyes, and gonads in both operators.

Conclusions:

• The incident revealed critical deficiencies in radiation safety control and regulation for NDT in Taiwan.
• Similar radiation safety issues persist in the NDT industry.
• Recommendations include revising radiation protection laws, enhancing worker training, and establishing protocols for acute radiation exposure events.