training for advanced research


Glossary terms about X-rays

X-rays are electromagnetic radiation with wavelengths in the range 0.01 to 10 nm.

4 pages mention X-rays

Applications and practical uses - what the SEM can do
View frozen material (in an SEM with a cryostage) Generate x-rays from samples for microanalysis (EDS; WDS) to determine chemical composition. 
Electron-matter interactions
Some electrons are bounced back out of the sample (backscattered electrons), others knock into atoms and displace electrons that, in turn, come out of the sample (secondary electrons); alternatively x-rays, and light or heat (in the sample) can be the result of these interactions. 
EM Laboratory Hazards
opening of improperly connected or unconnected gas cylinders). Radiation: (Uranium stains – used in TEM; and x-rays from EM's. 
High vacuum mode and pump system
Because backscattered electrons and characteristic x-rays are generally of higher energy than secondary electrons, their detection is not critically dependant on a high vacuum being maintained in the specimen chamber.