"\"Radioactivity\" means the number of radioactive decays of a material per second. \"Radioactivity concentration\" means radioactivity per unit volume of the medium. \"U\" means the element \"uranium\" and \"231U\" is the isotope \"uranium-231\" with a half-life of 4.29e+00 days."@en .
"SDN:P07::03NKJYIC" .
"radioactivity_concentration_of_231U_in_air"@en .
.
.
.
"SDN:P07::03NKJYIC" .
.
"1" .
"1" .
.
"SDN:P07::03NKJYIC" .
"2018-02-12 16:53:18.0" .
"" .
.
"accepted"@en .
"false" .
"2018-02-12 16:53:18.0" .