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Related Concept Videos

Radioactive Decay and Radiometric Dating02:48

Radioactive Decay and Radiometric Dating

Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time.
Radial System Protection01:23

Radial System Protection

Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...

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Related Experiment Video

Updated: Jul 2, 2026

Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level
08:53

Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level

Published on: June 6, 2018

Automatic radon counter for continual unattended operation.

R E Larson1, D J Bressan

  • 1Naval Research Laboratory, Washington, D. C. 20375.

The Review of Scientific Instruments
|July 1, 1978
PubMed
Summary

A new portable radon sampler offers rapid, sensitive atmospheric radon detection. This instrument provides reliable, remote measurements even in harsh marine environments for extended periods.

Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Instrumentation

Background:

  • Radon (Rn) is a naturally occurring radioactive gas.
  • Accurate measurement of atmospheric radon is crucial for environmental monitoring and health risk assessment.
  • Existing radon sampling methods may lack portability, sensitivity, or real-time data capabilities.

Purpose of the Study:

  • To introduce an improved portable radon sampler.
  • To detail its capabilities for atmospheric radon concentration measurement.
  • To highlight its operational advantages in various environmental conditions.

Main Methods:

  • Development of a portable radon sampler with remote sensing capabilities.
  • Utilizing a digital output for data logging and real-time monitoring.

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Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
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Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

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Last Updated: Jul 2, 2026

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  • Testing the instrument's performance under demanding conditions, including marine environments.

    • Main Results:

    • The sampler achieves high repetition rates (up to five samples per hour).
    • Demonstrates high sensitivity, detecting radon concentrations down to 0.1 pCi m⁻³.
    • Successfully operated in severe weather conditions at sea for up to two weeks without maintenance.

    Conclusions:

    • The improved portable radon sampler offers a robust and versatile solution for atmospheric radon monitoring.
    • Its design allows for remote operation and flexible data acquisition.
    • The instrument is reliable and effective even in challenging environmental settings.