X-ray films are often augmented by filters and screens. These filters and screen reduce scatter radiation, intensify and can take away from the image when used improperly. Most codes specify the thickness of intensifying screens required for a specific energy of radiation. The thicknesses are determined by the amount of intensification or absorption which the screens provide for the specific energy.
Industrial radiography is quickly being replaced by phased array ultrasonic nondestructive testing and GPR Ground penetration radar. Phased array is a safe alternative with adequate material penetration and internal mapping capabilities allowing the inspector to pinpoint the exact internal location of flaws without having to clear the area of people. So imagine doing an inspection in a busy office building. If you could use ultrasound or GPR and let everyone work around you; would you? or would you choose to clear three floors of people to take an x-ray shot.
When working around industrial radiographers your safety is important. The most important thing to observe is to ensure that you obey the yellow and magenta ropes and the radiation signs to keep yourself in the safe zone (low radiation zone). The x-ray technicians should have attended a radiation safety course and state requirements require the ropes and signs. Obey them for your safety. We strongly recommend keeping children and pregnant woman completely away from the area. If you are near industrial radiographers and they do not have the restricted/radiation area roped off I would contact your safety representative and have them ask questions.
X-ray Technicians keep themselves safe by keeping distance between themselves and the X-ray generation device which they are using. If you observe a technician they should have a film badge attached to their bodies usually on the waist or chest and a small tubular item called a dosimeter in their pocket or attached to their body. The other safety item that they use is a small handheld radiation detection device called a survey meter. If they are working with a live source they will also be wearing a little metal box on their hips called an alarm rate meter. All of these items are required to keep the inspectors and the public safe. The survey meter measures radiation rate or how much radiation the technician would get if he stood in that one spot for one hour. The film badge records absorbed radiation dose by the inspector and gets sent out for processing on a monthly basis to make sure the individual has not been accidentally exposed to radiation throughout the month. The Dosimeter is read at the end of the day for a radiation Roentgen measurement received that day and the alarm rate measures in absorbed dose rate and is designed to make a loud piercing sound if you are in a very dangerous radiation area.