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2. Radon - Wikipedia

   en.wikipedia.org/wiki/Radon

   Radon is a chemical element; it has symbol Rn and atomic number 86. It is a radioactive noble gas and is colorless and odorless. Of the three naturally occurring radon isotopes, only radon-222 has a sufficiently long half-life (3.825 days) for it to be released from the soil and rock where it is generated.

3. Radon mitigation - Wikipedia

   en.wikipedia.org/wiki/Radon_mitigation

   A typical radon test kit Fluctuation of ambient air radon concentration over one week, measured in a laboratory. The first step in mitigation is testing. No level of radiation is considered completely safe, but as it cannot be eliminated, governments around the world have set various action levels to provide guidance on when radon concentrations should be reduced.

4. ATI HPSS - Wikipedia

   en.wikipedia.org/wiki/ATI_HPSS

   ATI HPSS32 in service. The ATI Soundblaster HPSS (High-Power Speaker Station) is an electronic outdoor warning siren manufactured by Acoustic Technology, Inc (ATI) that is used to alert citizens of air raids, natural disasters and so on. The recent HPSS systems use high-powered electronic speakers, which can be independently arranged to provide ...

5. Federal Signal Modulator - Wikipedia

   en.wikipedia.org/wiki/Federal_Signal_Modulator

   Federal Signal Modulator. A Federal Signal Modulator siren in Bay Head, New Jersey. Federal Signal Modulators (also known as Modulator Speaker Arrays) are electronic warning devices produced by Federal Signal Corporation that are used to alert the public about tornadoes, severe weather, earthquakes, fires, lahars, tsunamis, or any other disaster.

6. Radon-222 - Wikipedia

   en.wikipedia.org/wiki/Radon-222

   Complete table of nuclides. Radon-222 ( 222 Rn, Rn-222, historically radium emanation or radon) is the most stable isotope of radon, with a half-life of approximately 3.8 days. It is transient in the decay chain of primordial uranium-238 and is the immediate decay product of radium-226. Radon-222 was first observed in 1899, and was identified ...

7. Civil defense siren - Wikipedia

   en.wikipedia.org/wiki/Civil_defense_siren

   A civil defense siren is a siren used to provide an emergency population warning to the general population of approaching danger. Initially designed to warn city dwellers of air raids ( air-raid sirens ) during World War II , they were later used to warn of nuclear attack and natural disasters , such as tornadoes ( tornado sirens ).

8. Former Obama adviser on ‘weird’ attacks: No downside but not ...

   www.aol.com/former-obama-adviser-weird-attacks...

   Dan Pfeiffer, a former senior adviser to former President Obama, said the recent trend of calling Republicans “weird” has no downside but also is not Democrats’ “secret sauce.” “Does ...

9. Federal Signal Corporation - Wikipedia

   en.wikipedia.org/wiki/Federal_Signal_Corporation

   https://www.federalsignal.com. Federal Signal Corporation is an American manufacturer headquartered in Downers Grove, Illinois. Federal Signal manufactures street sweeper vehicles, public address systems, emergency vehicle equipment, and emergency vehicle lighting . The company operates two groups: Federal Signal Environmental Solutions and ...