Matsuba Onsen
Analysis UnverifiedAbout 30 minutes by car inland from Kansai International Airport, Matsuba Onsen in Kotsumi, Kaizuka, lies along the Kogi River valley and draws radon-bearing water from the granite beneath the grounds. The source is a cool 26.8°C and is pumped at 83.3 liters per minute. Sodium, chloride and bicarbonate lead its chemistry, yet total dissolved solids are a modest 0.729 g/kg, and its 236.8 Bq/kg of radon classifies it as a simple weak radioactive spring, known locally for warming the body and keeping it warm.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
A rare radioactive spring where trace radiation absorbed via inhalation and skin is expected to stimulate cells (the "hormesis effect").
A trace component with gentle antibacterial and anti-inflammatory action.
Mild antibacterial action keeps the skin clean. Trace transdermal absorption supports tooth and bone health.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
▸Note
The temperature, pH and component values shown here are based on the hot spring analysis (source). Actual values in the bath may differ depending on heating, dilution, recycling and filtration. Please check current usage status at the facility.
Radioactive springs are traditionally enjoyed with slow soaks, breathing in the steam; take your time in cooler tubs and keep hotter ones short. At pH 8.4 the weakly alkaline water feels gentle on the skin.
With 236.8 Bq/kg of radon, this radioactive spring is traditionally associated with helping relieve pain, and its specific indications include gout and rheumatoid arthritis; long, relaxed soaks may support immune system stimulation as well.
Avoid overheating from long soaks and drink water afterward. There are no spring-specific contraindications, but refrain from bathing when unwell.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Matsuba Onsen
- Spring type
- Simple Spring
- Source temperature
- 26.8℃
- pH
- 8.4
- Flow rate
- 83.3 L/min
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2019-10-11
- Analyst organization
- 株式会社ケイ・エス分析センター
- Registration No.
- 大阪府 10
Cations
- Lithium ion Li⁺
- < 0.1 mg/kg
- Sodium ion Na⁺
- 219 mg/kg
- Potassium ion K⁺
- 0.40 mg/kg
- Ammonium ion NH₄⁺
- < 0.1 mg/kg
- Magnesium ion Mg²⁺
- < 0.1 mg/kg
- Calcium ion Ca²⁺
- 9.0 mg/kg
- Aluminum ion Al³⁺
- < 0.1 mg/kg
- Manganese ion Mn²⁺
- < 0.1 mg/kg
- Iron(II) ion Fe²⁺
- < 0.1 mg/kg
- Iron(III) ion Fe³⁺
- < 0.1 mg/kg
- Lead ion Pb²⁺
- < 0.001 mg/kg
- Strontium ion Sr²⁺
- 0.20 mg/kg
- Barium ion Ba²⁺
- < 0.1 mg/kg
- Copper ion Cu²⁺
- < 0.01 mg/kg
- Cadmium ion Cd²⁺
- < 0.001 mg/kg
- Total cations
- 0.23 mg/kg
Anions
- Fluoride ion F⁻
- 14.0 mg/kg
- Chloride ion Cl⁻
- 240 mg/kg
- Hydrogen sulfide ion HS⁻
- < 0.1 mg/kg
- Sulfate ion SO₄²⁻
- 2.2 mg/kg
- Bicarbonate ion HCO₃⁻
- 158 mg/kg
- Carbonate ion CO₃²⁻
- 21.6 mg/kg
- Bromide ion Br⁻
- 0.20 mg/kg
- Iodide ion I⁻
- 0.10 mg/kg
- Nitrite ion NO₂⁻
- < 0.1 mg/kg
- Nitrate ion NO₃⁻
- < 0.1 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.10 mg/kg
- Total anions
- 0.44 mg/kg
Undissociated Components
- Metasilicic acid H₂SiO₃
- 26.9 mg/kg
- Metaboric acid HBO₂
- 36.9 mg/kg
- Total undissociated
- 0.06 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- < 0.1 mg/kg
Trace Components
- Radon Rn
- 236.8 Bq/kg
Totals
- Total dissolved substances
- 0.73 mg/kg
- Component total
- 0.73 mg/kg
- Evaporation residue
- 0.53 mg/kg
Usage
- Usage status
- Unknown
Indications & Contraindications
- Bathing indications
- Hyperuricemia (gout), Rheumatoid arthritis, Ankylosing spondylitis
- General indications
- High blood pressure (mild), Autonomic instability, Insomnia, Depression, Chronic pain or stiffness in muscles and joints, Muscle stiffness due to motor paralysis, Gastrointestinal dysfunction
- Contraindications
- Acute illness (especially with fever), Active tuberculosis, Malignant tumors, Severe heart disease, Respiratory failure, Renal failure, Bleeding disorders, Severe anemia, Any actively progressing illness, Pregnancy (especially early and late stages), Undergoing radiation therapy, pregnancy (radioactive springs)
Drinking
- Drinkability
- Not drinkable
