1.

Regarding secondary electrons: a. Positrons are negatively charged electrons that result from radioactive decay b. Beta particles can ionize atoms c. The collision of two positrons results in two gamma photons, each with 511 keV d. The range of the secondary electron is inversely proportional to the material density e. Secondary electrons result in biological damage of tissues

Answer»

a. False. Positrons are positively charged electrons that result from radioactive decay. 

b. True. Beta particles are produced as a result of radioactive decay. Similar to photo electrons (photoelectric effect) and recoil electrons (Compton effect), they travel through material and interact with the outer shell of nearby atoms, resulting in them becoming ionized or excited. 

c. False. The collision of a positron with a negatively charged electron results in two gamma photons. 

d. True. 

e. True.



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