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Related Experiment Video

Updated: Jun 7, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

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Published on: May 3, 2019

Thoron measurements in Hungary.

¹Institute of Radiochemistry and Radioecology, University of Pannonia, Egyetem str. 10, Veszprem, Hungary.

Radiation Protection Dosimetry

|October 23, 2010

Summary

Radon and thoron gas were measured in Hungarian homes and workplaces. Thoron was detected frequently, especially in cellars, mines, and caves, indicating a need for further study on its health effects.

Area of Science:

Environmental Science
Radiological Protection
Public Health

Background:

Radon and thoron are naturally occurring radioactive gases.
Exposure to these gases can pose health risks.
Previous studies have focused primarily on radon, with less attention to thoron.

Purpose of the Study:

To measure thoron and radon concentrations in various Hungarian indoor environments.
To assess the potential dose contribution from thoron and its progeny.
To highlight the need for further investigation into thoron's health impacts.

Main Methods:

Passive measuring devices (Radopot® and Raduet®) were used for radon and thoron detection.
Measurements were conducted in dwellings, working places, mines, and caves in Hungary.

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Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides

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Detectors were placed 15-30 cm from walls for 1-3 month periods between 2003 and 2008.

Main Results:

Thoron was detected in almost all surveyed dwellings (∼100 Bq m⁻³), with higher concentrations in cellars (∼200 Bq m⁻³).
Elevated thoron levels were found in manganese mines (∼200 Bq m⁻³), bauxite mines (∼500 Bq m⁻³), and caves (∼1000 Bq m⁻³).
The thoron to radon concentration ratio often exceeded 0.25, suggesting a significant dose contribution from thoron progeny.

Conclusions:

Thoron is prevalent in various indoor environments in Hungary.
The dose contribution from thoron and its progeny is significant and cannot be neglected.
Further research on thoron progeny is essential for accurate dose estimations and risk assessment.