Specific activity 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 rates), the number of
Si Ronda Si Ronda Si Ronda is a 1930 silent film from the Dutch East Indies which was directed by Lie Tek Swie and starred Bachtiar Effendi. Based on contemporary Betawi oral tradition, it follows the exploits of a bandit, skilled in "silat" (traditional Malay martial arts), known as Si Ronda. In the "lenong" stories from which the film was derived, Ronda was often depicted as a Robin Hood type of figure. The production, now thought lost, was one of a series of martial arts films released between 1929 and 1931. "Si Ronda" received little coverage in the media upon its release.