A large fraction of fulvic acid-related compounds in the leachate drained from lan fill disposal sites is not efficiently removed by conventional coagulation treatment. The removal of the fulvic acid fractions with the coagulation treatment in combination with gamma irradiation under the anaerobic conditions was examined. It was found that the fulvic acid fractions were effectively removed by the combination method. When a fulvic acid solution (COD 700 ppm) of pH 2.0 was irradiated at a dose of 75 kGy and then coagulated with a concentration of 300 ppm ferric chloride, about 80% organic substances were removed.
In an atmospheric discharge of radioiodines, direct deposition of the nuclides onto leaf surface must be the most significant pathway from the environment to man. However, 129Ireaches man through several pathways because of its long half life of 1.6×107 years. Root uptake of 129I is one of the most important pathways of this nuclide. In Japan, rice is thought to be the most critical crop on the pathway. In this paper, uptake of radioiodine from irrigation water by rice plant was investigated. Rice plants, Oryza sativa ev. Nihonbare, were grown under flooded condition in Wagner pots containing soil collected in Tokai-mura. Iodine-131 was added as a tracer into the surface water in the pots at three different growing stages, heading, dough-ripe and yellowripe stages, respectively, and the plants were cultivated until the harvest time in a plant growth chamber. At the harvest time, concentration of 131I in each organ of rice plant was measured with a NaI scintillation counter. The profile of 131I in the soil was also investigated. The results obtained are as follows; (1) Activities of 131I in leaf blade and sheath of lower part were generally higher than those of upper part. Compared to the 131I activity of the flag leaf, the ratios of the activity in raehis-branch, hull and brown rice were 1.0-0. 5, 0.1 and 1-5×10-3, respectively. These may suggest that iodine taken up by the roots scarcely re-transloeated into rice. (2) Ratio of 131I in brown rice and hull was about 1: 4. (3) Activity ratio (“concentration of 131I in brown rice”/“average concentration of that in the soil” during 6 days uptake experiment.) was 4-5×10-4.
99mTc gated blood pool scans were studied to assess the left atrial function. Relationship between filling time and rapid emptying time was y=0.695 x+109 (r=0.761, p<0.05, n=14) in LAO and LPO projections. On the other hand, relationship between slow filling and rapid emptying time was good closely (y=0.846x+16.9 (p<0.01, r=0.975, n=8) ) in standard and retrograde acquisition. To assess the left atrial function by standard acquisition in LAO projection should be available for clinical use.
Tissue equivalent liquids (TE-liquids), which have the same elemental composition with that of ICRUUsphere, have been developed. The TE-liquids are made by adding some chemicals into pure water. The optimum amounts of additives can be obtained by solving simultaneous linear equations with unknown quantities of additive mole-ratios, which are derived from the numbers of elements and additives. According to the theory, TE-liquids with 2 and 3 additives were made, and low energy X-ray transmissions of the TE-liquids were examined for our purpose. The comparison of the experimental results with transmissions obtained from calculations has shown that the TE-liquids can be used as a phantom material for low energy photons.
Sternocostoclavicular hyperostosis (SCCH) is a rare disease that is characterized by hyperostosis and soft tissue ossification between the clavicles and the anterior part of the upper ribs. There have been few published reports, of99mTc-MDP bone imaging findings in this disease. Thirty-three patients who were suspected to have SCCH were studied with99mTc-MDP bone imaging. Bone images were abnormal in 31 (94%) of 33 patients. Chest radiographs were available in 30 patients, but negative in 14 (46%) of them. Bone imaging revealed also radionuclide accumulations in other bones such as the vertebrae, femur or sacroiliac joints in ten (14 sites) of 33 cases. Bone scintigraphy was useful in the diagnosis of sternoclavicular hyperostosis.