Radiology - CHAP. 2

Which e- have the greatest binding energy?        

K Shell

Which term describes two or more atoms that are joined by chemical bonds?   

Molecule

Which statement describes ionization?    

An atom that loses an e-

Which term describes the process by which unstable atoms undergo spontaneous disintegration in an effort to attain a more balanced nuclear state?        

Radioactivity

What’re the types of particulate radiation?          

 Alpha, Beta, & Protons

What’re the types of electromagnetic radiation?  

Radio wave, microwave, infrared radiation, visible light, UV, Xray, & Gamma ray (Remember acronym–Raging Martians Invaded Venus Using Xray Guns).

Which regulates the flow of electrical current to the filament of the X-ray tube?  

Low-voltage circuit

Which is used to increase the voltage in a high-voltage circuit?  

Step-up transformer

Which does not occur when the high-voltage circuit is activated?  

Xray travels from the filament to the target.

Which is the location where xrays are produced?     

Positive Anode

Which is the location where thermionic emission occurs?   

Negative Cathode

Which accounts for 70% of all X-ray energy produced at the anode?    

General Radiation

Which occurs at 70 kV or higher & accounts for a small part of xrays produced in a dental xray machine? 

Characteristic Radiation

Which describes primary radiation? 

Radiation that exits the tubehead.

Which describes scatter radiation?   

Radiation that has been deflected from its path by interaction with matter.

Which type of scatter occurs most often with dental xray?  

Compton

Which statements are correct?

- X-rays have more energy than visible light

- Velocity is the speed of a wave

- X-rays have no charge, cannot be focused to a point, & cause ionization

-Frequency & wavelength are inversely related

-Frequency is the number of wavelengths that pass a given point