Compounds and Elements to Know for the Registry

Gadolinium Oxysulfide

• rare earth compound used in a CCD for indirect conversion

• scintillator/phosphor

• turbid shaped

Cesium Iodide

• ionic compound used in a CCD for indirect conversion

• also used as input phosphor of image intensifier (sodium-activated)

• scintillator

• rod shaped

Crystalline Silicon

• form of silicon used in the CMOS for indirect conversion

  • complementary metal-oxide semiconductor

• semiconductor

• scintillator

• crystalline shaped

Amorphous Silicon

• form of silicon used in the photodiode layer in indirect conversion

• captures light from scintillators

• FPD

Amorphous Selenium

• form of selenium used in the photoconductor layer in direct conversion

• works as a photoconductor by directly absorbing x-rays, bypassing need for scintillator

• FPD

Barium Fluorohalide doped in Europium

• a photostimuable phosphor (PSP) used in phosphor layer of a CR plate

• absorbs xrays and creates a latent image that can be read by a plate reader

Silver-Activated Zinc Cadmium Sulfide

• phosphor used in the output phosphor layer of an image intensifier

• absorbs accelerated electrons and converts them back to light to be read

Tungsten

• high atomic number

• used for thermionic emission (creating electrons)

• found in the filament (focusing cup) in the x-ray tube

• found in the anode (target) in the x-ray tube

Molybdenum

• high atomic number

• found in the anode (target) in the x-ray tube

Rhenium

• used in an alloy along with tungsten (tungsten-rhenium alloy)