What is the composition of the output phosphor in an image intensifier?

The output phosphor in an image intensifier is typically composed of zinc cadmium sulfide (ZnCdS). This compound is known for its effectiveness in converting a received electron beam into visible light. When the input phosphor absorbs X-rays or other incoming radiation, it emits electrons, which are then accelerated towards the output phosphor. Upon interacting with the zinc cadmium sulfide, these electrons produce a bright visible image that can be viewed or recorded.

Zinc cadmium sulfide possesses efficient luminescent properties, making it suitable for high-efficiency image intensification. This material allows the image intensifier to provide significant brightness enhancement of low levels of radiation, which is crucial in medical imaging and certain radiographic applications. By understanding this composition and its role, one gains insight into how image intensifiers improve image quality in interventional radiology.