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Radiation
Halflife Amount Time

InstructionsEnter the halflife, original amount, and elapsed time since the original amount was measured then click Calculate button.
    
Related tools

Estimate your annual radiation dose

Virtual Geiger Counter
Gamma Detector for Energy Calibration and Unknown Isotope
Gamma Detector with data for gamma absorbtion
Detector and Aluminum X-ray absorption data
Cosmic Radiation exposure from Airplane flight
Gamma Exposure Calculator (Canada Government) [French version]

Advanced calculators

Radon Individual Dose Calculator
Uranium Radiation Individual Dose Calculator
Uranium U232-238 Decay Calculator
Universal Decay Calculator (497 nuclides)
Radioactive Decay Calculator (University of BC)

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