Fundamentals of X rays-UR Flashcards Preview

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Flashcards in Fundamentals of X rays-UR Deck (23)
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1

what are the three subatomic building blocks of an atom?

electrons, protons, and neutrons

2

which subatomic building block orbits the nucleus?

electrons

3

what are the two subatomic parts of a nucleus?

protons and neutrons

4

What term describe atoms with the same atomic number but different atomic masses?

isotopes

5

what is the letter designation for the first orbital shell around the nucleus?

the K-shell

6

what is an element?

a collection of atoms that have the same chemical properties

7

how is electromagnetic radiation measured?

with frequency and wavelength

8

what characteristic enables X rays to penetrate materials?

short wavelengths

9

What electromagnetic radiation has the same biological and photographic effect as X rays?

Gamma rays

10

what natural property does spontaneous atomic disintegration describe?

radioactivity

11

what happens when fast moving electrons change speed or direction abruptly?

energy in the form of X rays is produced

12

what determines the energy of an X-ray photon?

the degree of deceleration by the electron

13

what type of radiation contains one or more sharp peaks within a continuous spectrum?

characteristic radiation

14

What area of the tube head is positive?

anode

15

What area of a tube head is negative?

cathode

16

how are electrons emitted in a tube head?

by heating a filament to a high temperature

17

why is there a target in a tube head?

an electron beam has to strike a target before x rays are actually produced

18

what material is generally used in the construction of a target?

tungsten

19

Why is a small focal spot desired?

the smaller the focal spot- the better the detail of the x ray image

20

what causes electrons to be accelerated to the target?

step-up transformers

21

by which process do x rays give up all their energy to an orbital electron?

photoelectric effect (true absorption)

22

which x-ray matter interaction results in both a displaced electron and a deflected x-ray photon?

Compton effect

23

at what energy level does pair production occur?

1.02 MeV