BEO160829 EMF Flashcards
_____ _____ 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
The _____ generates and amplifies the signal.
Transmitter
Power is specified in _____.
Watts (W)
Frequency is specified in ____.
MegaHertz (MHz)
The _____ _____ carries the signal to the antenna.
Transmission Line
What are the two types of transmission lines?
- One conductor lines
- Two conductor lines
What is the main concern with transmission lines?
Leaks which may cause unknown exposure.
The _____ is the point at which electromagnetic energy is intentionally emitted.
Antenna
The _____ possess the greatest concern to health risk assessors.
Antenna
The _____ provides directivity or directonality of the electromagnetic energy.
gain
The _____ _____ is a measure of its ability to concentrate energy in a certain direction. It is UNITLESS.
Antenna Gain
The ____ of the antenna concentrates the energy to a spot.
Aperture
A _____ wave is always on so the duty factor (DF) = 1. Examples are radio stations.
Continuous Wave
A _____ wave is intermittent.
Pulsed Wave
The _____ _____ is 2 wavelengths away from the source.
Far-Field
The _____ _____ is between the near-field and far-field. It is difficult to characterize.
Transition Zone
The _____ _____ is less than 1 wavelength from the source.
Near-Field
EMF measurements are most often taken in the _____ _____.
Far-Field
What are the 5 types of emitters?
- Non-hazardous
- Ground Level
- Climbing
- Inaccessible
- Short Duration
What is the highest priority during evaluation of emitters?
Ground Level
What is the 2nd priority during evaluation of emitters?
Climbing
What is the 3rd priority during evaluation of emitters?
Inaccessible
TRUE or FALSE: When calculating EMF exposure, a “running average” is used approximately every 6 minutes?
TRUE
What are the 3 typical sources of EMF emitters?
- Aircraft Mounted
- Ground Fixed Satellite
- Mobile Systems
What is the most hazardous EMF source emmitter in the AF?
Aircraft Mounted
What are examples of Air Craft Mounted EMF emmitters?
AWACS
Fire Control
Radar Counter Measures
What are the BE EMF Program responsibilities?
* Inventory of EMF emitters every 2 years
* Health Risk Assessments
* Recommend Controls
* Investigate overexposures with PH
What are the Public Health EMF Program responsibilities?
* Assist with investigations
* Initiate and complete OI report
What are the Unit Commanders EMF Program responsibilities?
Establish program and procedures
What are the supervisors EMF Program responsibilities?
* Conduct initial and annual training.
* Notify BE of any new systems
The _____ _____ is measured from the antenna to the point at which MPE is found.
Hazard Distance (Dpel)
What is the objective of of the EMF survey?
- Identify the Dpel hazard distance
- Identify HOT SPOTS
E and H fields must be determined for frequencies less than _____ MHz.
300 MHz
For frequencies above _____ MHz, only one field component (E or H) need be measured.
300 MHz
What are examples of EMF engineering controls?
* interlocks
* shields
* Blanking
What are examples of EMF admin controls?
* Education and training
* Signs
* Cones
* Schedules
* Warning lights
_____ controls are not advocated or authorized for EMF exposures by the USAF.
PPE
When must flight medicine conduct a post exposure medical evaluation?
Within 72 hours of the incident - if the exposure level is 5 times the MPE.
Which agencies must be provided a copy of the written investigation report?
Patient, AFMSA BE, MAJCOM BE, PH, SE, ESOH service center.
The final investigative report must be distributed within _____ workdays.
30 days
_____ _____ is IR / UV radiation which behaves according to characteristics of geometric optics.
Optical Radiation
What wavelength region of the electromagnetic spectrum does UV radiation fall in?
100 - 400 nm
The _____ falls within the 315-400nm region (black light).
UVA
The ____ falls within the 280-315nm region (erythema).
UVB
The _____ falls within the 100-280nm region (ozone and germicidal)
UVC
At what range does sunburn occur?
250-300nm
What are engineering controls for UV radiation?
* Opaque barriers
* UV radiation blocking filters
* Interlocks
* Shade cover
What is the federal guidance for non-solar Eye and Face protection?
ANSI Z87.1-1979
What is the AF reference/guidance for Welding, Cutting, and ….
AFI 91-203
Because the primary source of IR radiation is heat (thermal radiation), any object with _________ radiates in IR.
Temperature
____ _____ is IR radiation closest in wavelength to visible light.
Near Field
____ ____ IR radiation are thermal - it is the heat we feel from from sunlight, fire, or a warm sidewalk heated by the sun.
Far Field
What thermal effects are associated with IR radiation?
* Acute skin burn
* Increased pigmentation
* Increased capillary …..
* Corneal and retinal burns
What are IR radiation hazard controls?
* Baffles and sight barriers = ENG
* Absorbing plastic materials = ADM
* OD glasses and Hats = PPE
_____ _____ ______ are systems using directed energy primarily as a direct means to damage or destroy enemy equipment and facilities and / or use of non-lethal directed energy to disrupt enemy personnel.
Directed Energy Weapons
What are two capabilities of directed energy weapons in use today?
- Acoustic Hailing Devices
- Optical distractors
At what frequency do directed energy weapons heat the outer layer of skin?
95GHz
What are the potential biological effects associated with directed energy overexposure?
* Thermal
* Ocular
* Acoustical