Extra x-ray practice
Card Set Information
Extra x-ray practice
X-ray practice 2
How many electrons are emitted by X-ray
What does X-ray depend on
atom atomic number
How many spectra does X-ray produce?
two major series type
Bohr Atomic Model Explains ...
Spectra of Hydrogen
Energy of atom is related to the distance of electron from nucleus
energy of atom is quantized
atom can only have certain specific energy states called
Quantum levels or energy levels
X-ray analysis is ___________ for the sample and X-ray spectrum is _________ complex than optical sepctra
___________ determines wavelength used for anlaysis
what is theta?
Anlge between incident beam and the lattice planes
it is _________ that determines the identity of elements in a sample
Common metal used in X-ray
Which part of the x-ray source causes the emission
What is Collimeter
it is a series of metal plates with holes in the middle. it is designed to absorb all X-rays not traveling in the proper direction.
Why normal grating or prism can not be used
X-ray would either pass through or be absorbed
Disperser is a
crystal mounted on a rotatable table
The entire spectrum is disperesed simultaneously (T/F)
As the crystal rotates ______, th edetector is rotated _____ to keep the detector in line with the _____-
What is the difference between XRD and XRF?
In XRD the electron are bounced off while in XRF wavelength is being emitted
X-ray reads Carbon atom (T/F)
Ionization Detector Contains________-,__________,______, and Solid state Detector contains________,_________,and________
Ionization chamber, proportion Counter, Geiger muller Tube
Fluorescent Screen, Scintillation Counter,PMT detector
What gas is used in ionization detector
Ionization Detector does
discriminate between different radiation (T/F)
In the semiconductor Detector, the detection is base on ...
Based on the current required to re-establish the depletion zone
What is the difference between WD-XRF and ED XRF Analysis?
has X-ray tube, Sample holder, Crystal, and detector. Wavelength is detected.
Detector can detect up to 24 element simultaneously
has only x-ray tube and sample holder. energy is being detected instead of wavelength.
Detector is sequential or Simultanous
Which XRF analysis has greater resolution and better S/N ratio?
Typical limits of detection
X-ray can be scattered by the planes in a crystal, resulting in both __________ and _________ interference
Constructive( results in diffraction)
Provides information on structure and chemical make up of materials
The repetitive patterns of the unit cell result in _________ that _______ x-rays
Atoms located exactly on a crystal plane produce _______- diffraction
Atoms located halfway between planes produce ____________- interference
What is Bragg's Law of Diffraction?
When an xray stikes a crystal, some of the xrays are scattered by the atoms at the surface
others penetrate the second layer of atoms where more scattering occurs
this scattering results in diffraction and will only occur if the
distance between atom layers is approximately the same as the wavelength of the xray
A ____________ may be used instead of film to yield exact _____ data
Parallel beam optics generated through..
Where does Gobel mirror located
Between Xray tube and sample
it will result in parallel beams to hit the sample
what kind of informatin can be obtained from a
Peak Position ------------------- dimention of the unit cell
Peak intensity-------------------- content of the unit cell
Peak broadening----------------- Strain/crystallite size