ASNT Industrial Radiography Radiation Safety Practice Test

What is the maximum curie strength of a Cobalt-60 source allowed in a type A exposure device?

1. 5.4 Ci

2. 10.8 Ci

3. 15.0 Ci

4. 20.0 Ci

The correct answer is: 10.8 Ci

The maximum curie strength of a Cobalt-60 source allowed in a type A exposure device is indeed 10.8 Ci. This limit is set to ensure safety standards are met in industrial radiography, specifically to minimize the radiation exposure potential to both operators and the public. Cobalt-60 is commonly used in radiography due to its favorable half-life and gamma emission properties, but because of its high-energy radiation, careful control of the source strength is essential. A type A exposure device is designed to safely contain and manage radiation during the inspection processes. The regulatory guidelines specify this maximum limit to provide an adequate safety margin, ensuring that the exposure levels remain within allowable limits for occupational and public safety. Understanding the regulations surrounding source strength in exposure devices highlights the importance of adhering to safety standards in the industry. The choice of 10.8 Ci reflects a balance between the need to utilize sufficient source strength for effective radiographic testing and the necessity to protect personnel and the environment from excessive radiation.