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level: Measuring radioactivity

Questions and Answers List

level questions: Measuring radioactivity

Question	Answer
The constant low-level radiation present in the environment that surrounds us at all times.	Background Radiation
What is background radiation?	The constant low-level radiation present in the environment that surrounds us at all times. We are always being irradiated by background radiation.
Origins of background radiation that occur naturally in the environment without human intervention.	Natural Sources
Where does background radiation come from?	Background radiation comes from both natural and human-made sources.
High-energy radiation originating from outer space, primarily from the sun and other celestial bodies.	Cosmic Rays
What are some natural sources of background radiation?	Natural sources of background radiation include certain foods, rocks, and cosmic rays from space.
Origins of background radiation resulting from human activities such as medical procedures, industrial processes, and nuclear accidents.	Human-Made Sources
What are some human-made sources of background radiation?	Human-made sources of background radiation include medical uses of radioactive materials, fallout from nuclear weapons testing, and nuclear accidents.
The amount of radiation a person receives from the environment, measured in sieverts or millisieverts.	Radiation Exposure
What factors determine the amount of background radiation a person receives?	The amount of background radiation a person receives depends on where they live and what their job is.
A device used to detect and measure radiation by recording the count-rate, which indicates the number of radioactive decays per second.	Geiger-Muller Tube
How is radiation measured?	Radiation can be measured by a detector called the Geiger-Muller tube.
The rate at which radioactive nuclei decay, measured as the number of decays per unit time, typically per second.	Count-Rate
What does the count-rate indicate?	A Geiger-Muller tube records the count-rate, showing the number of radioactive nuclei that decay each second.
A light-sensitive material that reacts to radiation exposure by darkening.	Photographic Film
How does photographic film react to radiation?	Photographic film also reacts to radiation by darkening.
The process by which photographic film becomes darker when exposed to radiation.	Darkening
How can the amount of radiation exposure be determined using photographic film?	If you develop a photographic film after a certain time, the amount of darkening shows the amount of radiation it's been exposed to.