BEO160829 EMF Flashcards
(81 cards)
_____ _____ are similar to a sound wave, have mutually supporting electric and magnetic fields, are non-ionizing, and have E field and H field which “compliment” each other at 90 degrees.
Electromagnetic Waves
_____ Rays originate from the nucleus.
Gamma
____ Rays originate from outer electron shells.
X
On the _____ _____, the wavelength is inversely proportional to the amount of energy. For example, as wavelength decreases, energy INCREASES.
Electromagnetic Spectrum
The _____ is the distance between peaks or troughs of a sinusoidal curve.
Wavelength
Wavelength and _____ are inversely related.
Frequency
The _____ is the number of COMPLETE wave cycles that pass a point in space in 1 second.
Frequency
Each _____ of a frequency, regarless of size, will have the same amount of energy.
Cycle
A _____ is a discrete packet of energy associated with electromagnetic radiation.
Photon
The only difference between the various types of electromagnetic radiation is the ____ ____ ____ found in the photons.
amount of energy
The unit of photon energy is the _____ or the _____ _____.
joule (j) or the electron volt (eV)
The energy of an electromagnetic wave of a certain frequency and wavelength is determined by multiplying the frequency by the energy of each cycle designated as _____ constant.
Planck’s Constant (h)
AFI _____-_____ is the Electromagetic Field Radiation Occupational and Environmental Health Program guidance.
48-109
Energy is transferred to tissue by _____ the water molecules in the tissue. It heats from “the inside out”.
Exciting
_____ _____ is influenced by the frequency of the incident radiation and by orientation of the object in the electromagnetic field.
EMF Absorption
_____ _____ fields occur at 3kHz to 5 MHz, cause currents to flow in the body, stimulate nerves and muscle cells, and have health consequences with very powerful magnetic field exposure.
LOW Frequency
EMF fields between _____ to _____ are capable of penetrating body tissue and heat it, with the penetration depth decreasing at higher frequencies, and the most sensitive organs having low blood flow (eyes, testicles, gall bladder, urinary bladder).
1 MHz to 10 GHz
EMF fields in the ____ to _____ frequency range are known as the “resonance range”, have wavelengths that are very close to the human size, the field energy is absorbed, and the LOWEST exposure limits are found in this range.
30 to 300 MHz
EMF fields above ____ GHz are absorbed at the skin surface with only a small portion of energy penetrating underlying skin.
10 GHz
The _____ _____ _____ is the rate at which energy is absorbed per unit mass, or dose rate.
Specific Absorption Rate
The _____ _____ _____ is the highest allowable rate of exposure of EMF.
Maximum Permissable Exposure (MPE)
The _____ _____ MPE are used at installations which have KNOWN EMF programs. The SAR is _____.
Upper Tier 0.4
The _____ _____ MPE are used for exposures where individuals have NO knowledge of exposure. The SAR is _____.
Lower Tier 0.08
What are the components of an EMF Emitter System?
- Transmitter
- Transmission Line
- Antenna
