sentences:  After a certain exposure time, the film is developed and it shows any internal defects of the material.Gauges - Gauges use the exponential absorption law of gamma rays
  
  Electrostatic control - To avoid the build-up of static electricity in production of paper, plastics, synthetic textiles, etc., a ribbon-shaped source of the alpha emitter 241Am can be placed close to the material at the end of the production line.The source ionizes the air to remove electric charges on the material.