Radon: Main Effects & Top 5

National maximum

3.1 mg/kg

New Heartpia Onsen

Table of Contents

What is Radon?
Main Effects
Radon Top 5 Hot Springs

What is Radon?

Radon (Rn) is a natural radioactive gas. Hot springs with trace amounts are classified as "radioactive springs," known for their hormesis effect benefiting gout and rheumatoid arthritis.

Main Effects

Indicated for gout and rheumatoid arthritis
Hormesis effect (cellular stimulation)
No body accumulation — 3.8-day half-life

Radon Top 5 Hot Springs

Top 5 hot springs registered on this site with the highest content.

RANK

RANK

RANK

Shijo Kawaramachi Onsen Soraniwa Terrace Kyoto Bettei

京都府 Shimogyo Ward, Kyoto

RANK

RANK

Noboribetsu Onsen Manseikaku

北海道 Noboribetsu

単純温泉

0.72mg/kg

* Top 5 among onsen analysis records registered in this app

References

SPRING TYPEMay 5, 2026· 2min read

Radioactive Springs: Traditional Radon Waters for Gout & Joint Conditions

Radioactive springs contain radon (Rn) at 30×10⁻¹⁰ Ci/kg (8.25 Mache units) or more. Indicated for hyperuricemia (gout), rheumatoid arthritis, and ankylosing spondylitis. The trace radioactivity levels are comparable to natural background radiation in daily life, and the short radon half-life (3.8 days) means it does not accumulate in the body.

SYMPTOMSMay 6, 2026· 1min read

Hot Springs for Gout | Radon Springs (Bathing) & Bicarbonate Springs (Drinking)

Japan's Ministry of the Environment guidelines recognise radon springs for bathing and bicarbonate springs for drinking as indicated therapies for gout and hyperuricemia. Each spring type works through different mechanisms to help manage uric acid levels.