The phosphor of soft tissue photographic screen is

The phosphor of soft tissue photographic screen usually refers to alkaline phosphatase (ALP) phosphor. ALP is a ubiquitous enzyme in bone system, liver and other organs, which can catalyze the hydrolysis of phosphoric acid, neutralize the substrate surface by acid and alkali, and generate red or pink reaction products. ALP in screened tissues is usually a high-purity enzyme preparation extracted from livestock and poultry bones. In soft tissue photography, doctors can apply ALP fluorescent body fluid to the examination place, and then expose the irradiated area to ultraviolet light. The fluorescent body will produce strong yellow fluorescence under the catalysis of enzymes. Compared with contrast adjustment tools, ALP phosphor is more sensitive, which can display the boundary between the area to be examined and the surrounding tissues more accurately, and help doctors to judge the location and scope of lesions more accurately.

Phosphorescence refers to the phenomenon that some molecules or substances can absorb energy after receiving light with a specific wavelength, and then release light with a longer wavelength and lower energy.