Tamagawa Hot Spring
Encyclopedia
The Tamagawa Hot Spring in Senboku
Senboku, Akita
is a city located in Akita, Japan.- The city of Semboku :Semboku was created on September 20, 2005 from the merger of Kakunodate, Tazawako, and Nishiki, all from Senboku District...

, Akita Prefecture
Akita Prefecture
is a prefecture of Japan located in the Tōhoku Region of northern Honshu, the main island of Japan. The capital is the city of Akita.- History :The area of Akita has been created from the ancient provinces of Dewa and Mutsu....

, Japan
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

 is the highest flow rate hot spring
Hot spring
A hot spring is a spring that is produced by the emergence of geothermally heated groundwater from the Earth's crust. There are geothermal hot springs in many locations all over the crust of the earth.-Definitions:...

 in Japan
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

. Tamagawa Hot Spring has a flow rate of 150 liters/second. The Tamagawa Hot Spring feeds a 3 meter wide stream with a temperature of 98°C. The water from Tamagawa Hot Spring is also very acidic, with a pH
PH
In chemistry, pH is a measure of the acidity or basicity of an aqueous solution. Pure water is said to be neutral, with a pH close to 7.0 at . Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline...

 of about 1.1.

There is also radioactive radium gas and other radioactive materials dissolved in the water from Tamagawa Hot Spring.

There are deposits of the radioactive mineral hokutolite near the spring. Hokutolite is composed of a type of barite
Barite
Baryte, or barite, is a mineral consisting of barium sulfate. The baryte group consists of baryte, celestine, anglesite and anhydrite. Baryte itself is generally white or colorless, and is the main source of barium...

 (barium sulfate), including lead and traces of strontium and calcium. The hokutolite is about ten times as radioactive as the standard background.

There is at least one more hot spring in Tamagawa
Tamagawa
may refer to the following places in Japan:*Tamagawa, Ehime, a former town in Ehime Prefecture that is now part of the city of Imabari*Tamakawa, Fukushima, a village in Fukushima Prefecture*Tamagawa, Saitama, a village in Saitama Prefecture...

. Nibukawa Hot Spring is also in Tamagawa.

See also

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