Question

The PMT functions to:

a. convert light to electrical signal
b. emit light in response to a gamma ray
c. filter radiation not originating perpendicular to the detector face
d. discard signal from background radiation

Answer 1

The PMT, or photomultiplier tube, converts light into electrical signals through the photoelectric effect.

Step-by-step explanation:

The PMT, or photomultiplier tube, functions to convert light into electrical signals. This is accomplished through the photoelectric effect, where light entering the photomultiplier strikes a metal plate, causing the ejection of electrons. These electrons are then attracted by a positive potential difference to the next plate, resulting in the ejection of two or more electrons. This process is repeated in stages, multiplying the number of electrons, and ultimately generating an output current proportional to the energy of the light entering the tube. Therefore, option a. — convert light to electrical signal — is the correct answer.