American Society for Nondestructive Testing (ASNT) Radiographic Testing Practice Test

The correct answer is lead glass, which is used as an x-ray barrier window in fluoroscopic equipment due to its unique properties. Lead glass incorporates lead oxide, which significantly enhances its ability to attenuate x-ray radiation. This characteristic is crucial in medical and industrial applications where radiation exposure is a concern. The density and composition of lead glass effectively absorb x-rays, thus protecting both the operator and the patient from excessive radiation.

In contrast, standard glass lacks sufficient density and atomic number to provide any meaningful barrier against x-ray radiation. Quartz glass, while durable and able to withstand high temperatures, does not offer the necessary radiation protection features required for fluoroscopic applications. Plastic sheeting, although lightweight and easy to handle, is not effective against x-ray radiation due to its low density and atomic composition, which does not provide adequate shielding. Therefore, lead glass is the preferred choice for ensuring safety and compliance with radiation protection guidelines in fluoroscopic settings.