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Non-Ionizing Radiation

Non-Ionizing Radiation. An electro-magnetic wave that has insufficient energy/quanta ( typically <10-34eV) to remove electrons from an atom. Electro-magnetic Spectrum. Types, affects and typical sources. Typical flight project sources:. S/C Transmitters

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Non-Ionizing Radiation

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  1. Non-Ionizing Radiation An electro-magnetic wave that has insufficient energy/quanta ( typically <10-34eV) to remove electrons from an atom.

  2. Electro-magnetic Spectrum Types, affects and typical sources

  3. Typical flight project sources: • S/C Transmitters • Flight instruments or GSE that emit radar, infrared or UV radiation. - Flash solar simulators (IR, UV) • Other projects or facilities • US Navy Aegis testing facility at Wallops Island (RF) • Aircraft down-looking radars (RF) • Shipboard surface search or fire control radars (RF) • Launch Range radars and transmitters (RF) • Welding (UV) • Launch vehicle avionics (RF) Note: All project personnel designing and working with RF and UV sources should be in the GSFC Radiation safety program as users and custodians.

  4. Concerns or hazards • Personnel injury • Eyes, male testes, stomach (RF) • Skin and eyes (UV; IR) are most susceptible organs. Exposure limits: - For RF; rule of thumb is <10 mW/cm2 surface power density. (See GPR 1860.3) -For UV and IR; Possible burning of skin or eyes; (See GPR 1860.4) -For GSE, guidance is often provided in manufacturer’s documentation. ° Controls (RF) • Temporary shielding, usually in the form of absorbent hats for antennas. • Distance, determined by analysis and verified by testing. Always go to Code 350, Radiation Safety Office for support. • Design power inhibits in the GSE and the s/c to provide control when the hats are not viable.

  5. Concerns or hazards • Controls (UV; IR) • For UV and IR, typical controls are shielding, such as barriers or curtains. • For personnel working inside barriers; PPE in the form of long sleeves and pants, closed toe shoes and approved face shields. • Always go to Code 350 Radiation Safety Office for guidance. Note: All RF, UV and IR sources must be identified to the PSWG. Project personnel and hardware must be identified via applicable forms to the Range radiation safety office.

  6. Concerns or hazards • Damage to flight hardware -Damage to electronic components (Payload and Launch Vehicle) • Requirements set by Launch Vehicle ICD and/or launch range environmental requirements • -Controlled by shielding and bonding per requirements of Mil-Std461 • Controlled by power inhibits to own sources when integrated to the launch vehicle • Damage to pyro-circuitry or unintended initiation • Controlled by design, shielding and bonding per requirements of Mil-Std 1576 Note: Verification of design and hardware can only be performed properly by EMI/EMC testing. This is an area that is not well served by analysis only.

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