Izutsuya Onsen No. 2
Analysis UnverifiedNekonaki Onsen rises beside the Kitasu River in Ishikawa, central Fukushima. Legend says that when the Heian-era poet Izumi Shikibu left for the capital, her cat cried for her until it fell ill, then recovered by bathing here, giving the spring its name, "crying cat." The Ishikawa area is dotted with radioactive springs, and Izutsuya Onsen No. 2, pumped from the ground at 18.4°C, is a cold mineral spring. Its total mineral content is a light 128.2 mg/kg, yet carbonate ions reach 36.1 mg, giving it a strongly alkaline pH of 10.1.
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").
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.
At pH 10.1 the water softens the skin's surface, so soak slowly without over-scrubbing and moisturize afterward. Radon from radioactive springs is also taken in by breathing, so breathe calmly near the water's surface.
With 112.9 Bq/kg of radon, this radioactive spring has long been traditionally associated with helping relieve pain and supporting immune system stimulation, while its pH 10.1 alkalinity feels smooth on the skin, true to the legend of the cat that recovered here.
The water is strongly alkaline, so those with sensitive skin should avoid long soaks and rinse with fresh water and moisturize afterward. Skip bathing if you feel unwell or bath-fatigued.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Izutsuya Onsen No. 2
- Spring type
- Alkaline Simple Cold Mineral Spring
- Old spring type name
- 放射能冷鉱泉
- Source temperature
- 18.4℃
- pH
- 10.1
- Flow rate
- 10 L/min
- Flow type
- 動力揚湯
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2018-01-10
- Analyst organization
- 一般社団法人福島県薬剤師会
- Registration No.
- 福島県第1号
Cations
- Sodium ion Na⁺
- 35.6 mg/kg
- Potassium ion K⁺
- 0.50 mg/kg
- Magnesium ion Mg²⁺
- 0.10 mg/kg
- Calcium ion Ca²⁺
- 1.2 mg/kg
- Aluminum ion Al³⁺
- 0.20 mg/kg
- Manganese ion Mn²⁺
- 0.00 mg/kg
- Iron(II) ion Fe²⁺
- 0.10 mg/kg
- Lead ion Pb²⁺
- < 0.005 mg/kg
- Copper ion Cu²⁺
- < 0.01 mg/kg
- Total cations
- 0.04 mg/kg
Anions
- Fluoride ion F⁻
- 0.10 mg/kg
- Chloride ion Cl⁻
- 3.7 mg/kg
- Hydroxide ion OH⁻
- 2.1 mg/kg
- Hydrogen sulfide ion HS⁻
- 0.00 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.00 mg/kg
- Sulfate ion SO₄²⁻
- 8.3 mg/kg
- Bicarbonate ion HCO₃⁻
- 6.1 mg/kg
- Carbonate ion CO₃²⁻
- 36.1 mg/kg
- Hydrogen metasilicate HSiO₃⁻
- 33.8 mg/kg
- Metaborate ion BO₂⁻
- 0.30 mg/kg
- Total anions
- 0.09 mg/kg
Undissociated Components
- Total undissociated
- 0.00 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.00 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Trace Components
- Radon Rn
- 112.9 Bq/kg
Totals
- Total dissolved substances
- 0.13 mg/kg
- Component total
- 0.13 mg/kg
- Evaporation residue
- 0.11 mg/kg
Usage
- Heating
- Yes（同掲示『入浴に適する温度に加温しております』（源泉18.4℃の冷鉱泉）。）
- Dilution
- No
- Recycle / Filter
- Recycled / Filtered / 同掲示『衛生管理のため循環ろ過装置を使用しております』。
- Additives
- No
- Disinfection
- Yes（塩素系薬剤）
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
