Radioactive Substance Analysis Test (Yuzu)
- KIWITA
- Jan 15
- 2 min read
Radioactive Substance Analysis Test (Yuzu)
Regarding radioactive substance measurement results using non-destructive radioactivity measurement equipment
Fukushima City Environment Department Environment Division
Director of Radiation Monitoring Center
(official seal omitted)
On December 17, 2013, we submitted the following yuzu to a radioactive material analysis test.
1. Measurement date: December 10, 2013
2. Measurement results: Yuzu
Measurement details & Concentration (Unit: Bq/kg)
Radioactive Cesium: 242 Bq/kg
The specimen [Yuzu] was submitted to the analysis agency in the following three patterns.
①Unwashed (approx. 1000g)
No cleaning
②Wash with pure water (approx. 1000g)
Soak in 3000ml of pure water for 5 seconds. After that, lightly rinse the surface of the yuzu with 3000ml of pure water.
③ Wash with 10 times diluted umo concentrated solution (approx. 1000g)
Soak in 3000ml of 10x diluted UMO concentrated solution for 5 seconds. After that, lightly rinse the surface of the yuzu with 3000ml of UMO concentrated solution diluted 10 times.
Result
①Unwashed (approx. 1000g)
Test item result
Iodine-131 Not detected
Cesium-134 66Bg/kg
Cesium-137 150Bg/kg
②Wash with pure water (approx. 1000g)
Test item result
Iodine-131 Not detected
Cesium-134 63Bg/kg
Cesium-137 140Bg/kg
③ Wash with 10 times diluted umo concentrated solution (approx. 1000g)
Test item result
Iodine-131 Not detected
Cesium-134 54Bg/kg
Cesium-137 130Bg/kg
Notes 1
0.7L marine container, measurement time: 1000 seconds. The lower limit of detection and the valid figures of the test results were in accordance with "2.3 Handling of test results" of Food Safety Agency No. 0315 No. 4 "Inspection method for radioactive cesium in food".
Explanation
Iodine-131: This is a type of iodine that's radioactive. It's used in medicine but can also be released during nuclear accidents. It doesn't stick around for long, though, as it decays quickly.
Cesium-134: This is a radioactive form of cesium. It's made during nuclear reactions and can be released in accidents. It lasts longer than Iodine-131 but still decays over time.
Cesium-137: Another type of radioactive cesium. It's also produced in nuclear reactions and can be released during accidents. It sticks around for a long time, which can be a problem for the environment.
Note: This paper is translated from the following URL. The content is provided for reference on the scientific research of the raw material only. Whether APA raw materials are used or not, we hope this research will help increase understanding and awareness of body minerals.
Comments