Technetium-99 Behavior in the Terrestrial Environment

Technetium-99 Behavior in the Terrestrial Environment Field Observations and Radiotracer Experiments

Obtaining data on 99Tc in the rice paddy field environment is important because Tc is a redox sensitive element. The behavior of Tc is expected to be different under upland field and rice paddy field conditions since the redox conditions in the soil environment differ. However, most of the data on the nuclide behavior in soil were obtained under upland field conditions. To understand the global...

Fallout Technetium - 99 Distribution and Behavior in Japanese Soils

Environmental amounts of Tc have been accumulating because of its long half-life of 2.1 × 10 y. This pure β-emitter (Emax= 0.29 MeV) is produced in the fission of U or Pu with a relatively high fission yield of ca. 6%, and it has been released to the environment through nuclear weapons tests and nuclear industries. The quantity of Tc produced by atmospheric nuclear weapon explosions was estimat...

Technetium-99 Behavior in Savannah River Site High Level Waste Sludges during Waste Processing

Technetium-99 m in the diagnosis of thyrotoxicosis.

The thyroid uptake at 20 minutes of intravenously administered Technetium-99(m) ((99m)Tc) was measured in 117 patients with a standard scintillation counter. Patients were divided into three groups on the basis of clinical assessment, four-hour (131)I uptake, triiodothyronine (T-3) resin uptake, and protein-bound iodine measurements.In 31 patients with no evidence of thyroid disease the mean (9...

Accumulation of technetium-99 in the Irish Sea?

An assessment has been carried out to determine the impact of continued (99)Tc discharges into the Irish Sea from the nuclear fuels reprocessing plant at Sellafield. Samples of surface and bottom seawater and sediment have been collected from the Irish Sea and analysed for (99)Tc. The information has been used, together with supporting data, to determine the effect of summer stratification upon...