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https://www.radsafetech.com/productstags/civil-defense-geiger-counter.html          
 
Geiger counter is a colloquial name for any hand-held radiation measuring device in civil defense               , but most civil defense devices were ion-chamber radiological survey meters capable of measuring only high levels of radiation that would be present after a major nuclear event.     
 
Most Geiger and ion-chamber survey meters were issued by governmental civil defense organizations in several countries from the 1950s amid the Cold War to help prepare citizens for a nuclear attack.     
 
Many of these same instruments are still in use today by some states, Texas amongst them, under the jurisdiction of the Texas Bureau of Radiation Control. They are regularly maintained, calibrated and deployed to fire departments and other emergency services.     

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