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in Physics by (95.2k points)

Regarding the X-ray tube anode: 

a. It is the site of thermionic emission 

b. Tungsten is a suitable target material 

c. Electrons striking the anode mostly convert their energy into X-ray photons 

d. It is usually rotating 

e. The anode material used in mammography is the same as in general radiology

1 Answer

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a. False. Thermionic emission occurs in the cathode, and the released electrons are targeted on the anode target. 

b. True. This is due to its high melting point and high atomic number (Z = 74), which increases the degree of Bremsstrahlung. 

c. False. The energy of the electrons is mainly converted into heat, which is why the anode must be able to tolerate a significant temperature rise. Less than 1% is converted to X-ray photons. 

d. True. The anode may be stationary or rotating. Rotating anodes are used for better tolerance of the heat generated during the production of X-rays, as the heat is spread over a larger area. 

e. False. Rhodium (Z = 45) and molybdenum (Z = 42) are chosen due to the useful energies of characteristic radiation.

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