TAILIEUCHUNG - RADIATION HAZARDS

Radiation Hazard (RADHAZ) describes the hazards of electromagnetic radiation to fuels, electronic hardware, ordnance, and personnel. In the military these hazards are segregated as follows: | RADIATION HAZARDS Radiation Hazard RADHAZ describes the hazards of electromagnetic radiation to fuels electronic hardware ordnance and personnel. In the military these hazards are segregated as follows 1 Hazards of Electromagnetic Radiation to Personnel HERP 2 Hazards of Electromagnetic Radiation to Ordnance HERO 3 Hazards of Electromagnetic Radiation to Fuel HERF The current industrial specifications for RADHAZ are contained in ANSI IEEE which was used as a reference to create the combined Navy regulation NAVSEA OP3565 NAVAIR 16-1-529. Volume I contains HERP and HERF limits - its current version is REV 5. Volume II REV 6 covers HERO. These limits are shown in Figure 1 although all values have been converted to average power density. Figure 1. Radiation Hazards to Personnel and Ordnance OP 3565 specifies HERO RADHAZ levels at frequencies below 1 GHz in peak value of electric field strength V m while levels above 200 MHz are specified in average power density mW cm2 - note the overlapping frequencies. Since Figure 1 depicts power density as the limits you must convert the average values to peak field strength for use at lower frequencies. Also many applications of EMC work such as MIL-STD-461 use limits based on the electric E field strength in volts meter. Remember that P E2 R and from Section 4-2 we note that R 377Q for free space. It can also be shown that the magnetic field strength H field in Amps meter I m where I E R. Don t forget that RMS Peak. With the units of PD in mW cm2 E in V m and H in A m then PD mW cm2 E2 3770 H2 It should thus be noted that a 100 times increase in power mW cm2 is only a 10 times increase in V m. The potential dangers to ordnance and fuels are obvious because there could be an explosive chain reaction by exploding consequently these limits are generally lower than personnel limits. There are three HERO categories. The HERO limit 2 is for HERO unsafe or unreliable explosive devices with exposed wires arranged in

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