Strontium unit Strontium unit The strontium unit is a unit used to measure the amount of radioactivity from strontium-90, a radionuclide found in nuclear fallout, in a subject's body. Since the human body absorbs strontium as if it were calcium, incorporating it into the skeleton, its presence is very common. One strontium unit is equal to one picocurie from strontium-90 per gram of calcium (37 becquerels per kilogram) in the subject's skeleton. The United States National Academy of Sciences holds that the maximum safe measure of strontium-90 in a person is one hundred strontium units (3700 Bq/kg). The average American is estimated
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.