كيمياء إشعاعية: الفرق بين النسختين

Radioactivity is present everywhere (and has been since the formation of the earth). According to the [[International Atomic Energy Agency]], one kilogram of soil typically contains the following amounts of the following three natural radioisotopes 370 Bq ⁴⁰K (typical range 100–700 Bq), 25 Bq ²²⁶Ra (typical range 10–50 Bq), 25 Bq ²³⁸U (typical range 10–50 Bq) and 25 Bq ²³²Th (typical range 7–50 Bq).<ref>"Generic Procedures for Assessment and Response during a Radiological Emergency", International Atomic Energy Agency TECDOC Series number 1162, published in 2000 [http://www-pub.iaea.org/MTCD/publications/PubDetails.asp?pubId=5926]</ref>▼