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Measurement samples

Work Sheet

Measurement samples

Measurement samples

Grade		Class		Student ID number
Name

1	■Natural Radi Ionizing radiation is all around us. Where does this radiation come from?	Please make a guess and check the corresponding box. Space Earth Air Food
2	■Radioactive Material, Radioactivity, and Radiation Radiation originates from radioactive materials. Let us think about where radioactive materials can be found around us. “Radioactivity” means “the ability to emit radiation” and refers to the power of radioactive materials to emit radiation.
3	■Radiation in Our Daily Lives Check out the website below, and learn more to confirm your guesses above. https://www.radi-edu.jp/kids/illust/minomawari https://www.radi-edu.jp/kids/illust/minomawari
4	Radiation Measurement (1) Measurement samples are explained in detail on the next page. Click the CSV* button below to download them. Granite CSV Salt (for people with high blood pressure) CSV Ship-bottom paint　CSV Potash fertilizer　CSV Hot-spring mineral deposits　CSV CSVfiles: The columns (cells) of CSV files are arranged in the following order from left to right: Date, Time, Measured values, Latitude, Longitude, Altitude, and Total Count. Find the information you need in the data and use it for your calculations and graph. ★Click the CSV button to download the data.	Granit Salt Ship-bottom paint Potash Fertilizer Hot-spring mineral deposits
5	■Radiation Measurement (2) Using measurement data, obtain the average of measured values, and record them in the table on the right.	Measurements 　Granite µSv/h 　Salt (for people with high blood pressure） µSv/h 　Ship-bottom paint µSv/h 　Potash fertilizer µSv/h 　Hot-spring mineral µSv/h

Measurement sample

Granite	Granite is often used for gravestones and building materials (paving stones, monuments, kitchen countertops, and others). This type of rock contains various radioactive elements, including the thorium series, the uranium series, and potassium-40.
Salt (for People with High Blood Pressure)	Generally, “salt” refers to sodium chloride; however, a type of salt that contains potassium chloride is available in the market. This salt can be used by people suffering from high blood pressure. This “salt,” when used as a measurement sample, is found to contain sodium chloride and potassium chloride at a ratio of 50:50.
Ship-Bottom Paint	To prevent barnacles, shellfish, seaweed, etc. from adhering to the bottom of a ship, additives are sometimes mixed with the ship-bottom paints. These additives contain radioactive materials from the thorium and uranium series.
Potash Fertilizer	Fertilizers are essential for plant growth. Nitrogen, phosphorus, and potassium are the three main elements in fertilizers. Particularly, potassium helps in root growth. Radiation comes from potassium-40 nuclei, which are naturally found in potassium.
Hot-Spring Mineral Deposits	The left is an image of a sample derived from hot-spring mineral deposits (solidified hot spring components) from Tamagawa Onsen in Akita Prefecture, one of Japan’s radon hot springs. These hot-spring deposits contain radioactive materials, including those in the thorium series and uranium series.

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