Related Experiment Video
Updated: Nov 7, 2025

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
Published on: January 30, 2020
Comparison experiments for radon and thoron measuring instruments at low-level concentrations in one room of a
Atsuyuki Sorimachi1, Yuichi Nagamatsu2, Yasutaka Omori3
1Integrated Center for Science and Humanities, Fukushima Medical University, 1 Hikariga-oka, Fukushima, 960-1295, Japan; Department of Radiation Physics and Chemistry, Fukushima Medical University, 1 Hikariga-oka, Fukushima, 960-1295, Japan.
Abstract:
A comparison on commercially available radon (222Rn) measuring instruments (three types of continuous monitors and a passive 222Rn-thoron (220Rn) discriminative alpha track detector) was carried out at low-level concentrations in one room of a concrete building. The agreements between the continuous monitors were within 15%, while the agreements between each instrument were within 20%. It was also observed that the indoor 220Rn concentration measured by the continuous monitor was quite different from those by the passive detectors due to the mean concentration less than the limit of detection of both measuring instruments.
Related Concept Videos
Measurement of Air Content in Concrete
The pressure method,...
Atomic Absorption Spectroscopy: Lab
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...

