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DOE-HDBK-1109-97
Radiological Safety Training for Radiation-Producing (X-Ray) Devices
Student's Guide
Electromagnetic Radiation
Type
Typical Photon Energy
Typical Wavelengths
radio wave
1 ueV
1m
1 mm (10-3m)
1 meV
1 um (10-6m)
1 eV
6000 Angstrom (10-10m)
red light
2 eV
violet light
3 eV
4000 Angstrom
ultraviolet
4 eV
3000 Angstrom
X-ray
100 keV
0.1 Angstrom
gamma ray
1 MeV
0.01 Angstrom
ii. X-Rays and Gamma Rays.
X-rays and gamma rays both ionize atoms. The energy required for ionization varies with
material (e.g., 34 eV in air, 25 eV in tissue) but is generally in the range of several eV. A
100 keV X-ray can potentially create thousands of ions.
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