Attachment Radiation Hazard

This document pretains to SES-LIC-20131115-01134 for License on a Satellite Earth Station filing.

IBFS_SESLIC2013111501134_1020443

ANALYSIS OF NON-IONIZING RADIATION for CHEVRON USA INC Site: Big Foot Platform State: GM Latitude: 26 56 18.0 Longitude: 90 31 24.0 (NAD83) 05-24-2013 The Office of Science and Technology Bulletin, No. 65, October 1985 and revised August 1997, specifies that the maximum level of non-ionizing radiation that a person may be exposed to over a six minute period is an average power density equal to 5 mW/cm**2 (five milliwatts per centimeter squared) for a controlled environment. For an uncontrolled environment, the maximum level of non-ionizing radiation that a person may be exposed to over a thirty minute period is an average power density equal to 1 mW/cm**2 (one milliwatt per centimeter squared). It is the purpose of this report to determine the maximum power flux densities of the earth station in the far zone, near zone, transition zone, at the main reflector surface, and between the antenna edge and the ground. Parameters which were used in the calculations: =============================================== Antenna Diameter, (D) = 2.4000 m Antenna Surface Area (Sa) = pi(D**2)/4 = 4.5239 m**2 Wavelength at 6.1750 GHz (lambda) = 0.0485 m Transmit Power at Flange (P) = 60.0000 Watts Antenna Gain at Earth Site (GES) = 41.7000 dBi = 14791.0839 Power Ratio: AntiLog(GES/10) pi = 3.1415927 Antenna Aperture Efficiency (n) = 0.6000

1. FAR ZONE CALCULATIONS ======================== Distance to the Far Zone (Df) = (n)(D**2) = 71.2577 m --------- lambda Far Zone Power Density (Rf) = (GES)(P) = 13.9084 W/m**2 ------------ 4*pi*(Df**2) = 1.3908 mW/cm**2 2. NEAR ZONE CALCULATIONS ========================= Power Flux Density is considered to be at a maximum value throughout the entire length of this Zone. The Zone is contained within a cylindrical volume which has the same diameter as the antenna. Beyond the Near Zone, the Power Flux Density will decrease with distance from the Antenna. Distance to the Near Zone (Dn) = D**2 = 29.6907 m -------- 4*lambda Near Zone Power Density (Rn) = 16.0(n)P = 31.8310 W/m**2 -------- pi(D**2) = 3.1831 mW/cm**2 3. TRANSITION ZONE CALCULATIONS =============================== The Power Density begins to decrease with distance in the Transition Zone. While the Power Density decreases inversely with distance in the Transition Zone, the Power Density decreases inversely with the square of the distance in the Far Zone. Since the maximum Power Density in the Transition Zone will not exceed the Near Zone values, it is not calculated.

4. MAIN REFLECTOR ZONE ====================== Main Reflector Power Density = 2(P) = 26.5258 W/m**2 ---- Sa = 2.6526 mW/cm**2 5. ZONE BETWEEN THE MAIN REFLECTOR AND THE GROUND ================================================= Applying uniform illumination of the Main Reflector Surface: Main to Ground Power Density = P = 13.2629 W/m**2 ---- Sa = 1.3263 mW/cm**2

CALCULATED SAFETY MARGINS SUMMARY AND EVALUATION -------------------------------------------------------------------------- Controlled Safety Margin = 5.0 - Calculated Zone Value (mW/cm**2) -------------------------------------------------------------------------- Safety Zones Margins Conclusions (mW/cm**2) ---------------------------- ------------ ---------------------------- 1. Far Zone 3.6092 Complies with ANSI 2. Near Zone 1.8169 Complies with ANSI 3. Transition Zone Rf < Rt < Rn Complies with ANSI 4. Main Reflector Surface 2.3474 Complies with ANSI 5. Main Reflector to Ground 3.6737 Complies with ANSI -------------------------------------------------------------------------- Uncontrolled Safety Margin = 1.0 - Calculated Zone Value (mW/cm**2) -------------------------------------------------------------------------- Safety Zones Margins Conclusions (mW/cm**2) ---------------------------- ------------ ---------------------------- 1. Far Zone -0.3908 POTENTIALLY HAZARDOUS 2. Near Zone -2.1831 POTENTIALLY HAZARDOUS 3. Transition Zone Rf < Rt < Rn Complies with ANSI 4. Main Reflector Surface -1.6526 POTENTIALLY HAZARDOUS 5. Main Reflector to Ground -0.3263 POTENTIALLY HAZARDOUS 6. EVALUATION ============== A. Controlled Environment B. Uncontrolled Environment The FAR ZONE does not comply with the ANSI standards! WARNING SIGNS will be posted for the affected Zone indicating danger while the system is in use. Additionally, the system will be shut down for servicing. The NEAR ZONE does not comply with the ANSI standards! WARNING SIGNS will be posted for the affected Zone indicating danger while the system is in use. Additionally, the system will be shut down for servicing. The MAIN Reflector Surface ZONE does not comply with the ANSI standards! WARNING SIGNS will be posted for the affected Zone indicating danger while

the system is in use. Additionally, the system will be shut down for servicing. The MAIN Reflector to GROUND ZONE does not comply with the ANSI standards! WARNING SIGNS will be posted for the affected Zone indicating danger while the system is in use. Additionally, the system will be shut down for servicing.


Document Created: 2013-05-24 14:44:18
Document Modified: 2013-05-24 14:44:18
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