Strontium-89 and Strontium-90 are radioactive isotopes of the chemical element strontium, with atomic numbers 38 and mass numbers 89 and 90, respectively. They are produced as byproducts of nuclear fission, particularly in nuclear reactors and during the detonation of nuclear weapons. Strontium-90 has a longer half-life of approximately 28.8 years, while Strontium-89 has a much shorter half-life of about 50.5 days. Both isotopes are bone-seekers, meaning they can accumulate in the skeletal system, posing significant health risks such as bone cancer and leukemia due to their radioactive decay. Strontium-89 is sometimes used in medical treatments, particularly for pain relief in patients with bone metastases from cancer, while Strontium-90 is a concern in environmental contamination and radiation exposure.
The CAS Registry Mumber 11-10-9 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 1 and 1 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 11-10: (4*1)+(3*1)+(2*1)+(1*0)=9 9 % 10 = 9 So 11-10-9 is a valid CAS Registry Number.
In Finland the deposition of strontium-89 (90Sr) and strontium-90 (90Sr) has been monitored since the early 1960s. The measured cumulative 90Sr deposition in 1963–2005 is on average 1200 Bq m−2, of which 150 Bq m−2 originates from the Chernobyl accident. Adding to this the deposition in 1945–1...detailed