Specific activity several other biomedical applications. Specific activity Specific activity is the activity per quantity of a radionuclide and is a physical property of that radionuclide. Activity is a quantity related to radioactivity. The SI unit of activity is the becquerel (Bq), equal to one reciprocal second. The becquerel is defined as the number of radioactive transformations per second that occur in a particular radioactive isotope. Its related non-SI unit equivalent is the Curie (Ci) which is transformations per second. Since the probability of radioactive decay for a given radionuclide is a fixed physical quantity (with some slight exceptions, see changing decay
Si Prat are found in "Khamhaikan Khun Luang Ha Wat" and "Khamhaikan Chao Krung Kao", documents derived from an original Mon chronicle compiled from the testimony of Siamese captives following the fall of Ayutthaya in 1767. These documents focus on his banishment and death, but state that they happened during the reign of King Suriyenthrathibodi, several decades later than Narai. The detailed biography which gives explicit years for Si Prat's birth and death and places his lifetime during Narai's reign was written by Phraya Pariyattithammathada (Phae Talalak) and published as "Tamnan Si Prat" ("The Legend of Si Prat") in 1919. The work,