Neutron radiography (NR) was applied to investigate the water movement in soil during the growth of the soybean plant, non-destructively. The plant was grown in a thin aluminum container and was set to the cassette where an X-ray film and a gadrinium converter were sealed in vacuum. Periodically, the sample was taken to the nuclear reactor, JRR-3, installed at Japan Atomic Energy Research Institute. Total neutron flux irradiated was 1.9×107n/cm2. After irradiation the X-ray film was developed and the sample image was scanned to get the water image. The darkness of the image was corresponded well with the water amount and the resolution was found to be about 15μm. Scanning of the image along with the horizontal line showed that much amount of water in the soil was decreased at the part adjacent to the root, compared to that of 1-2 mm far from the root. It was also shown that there is the unsymmetrical water uptake of the root at the same depth position. To know the water movement, especially around the secondary root, three dimensional water image was depicted. When the secondary root began to develop, the largest water movement around the primary root was observed especially at the opposite side of the secondary root.
123I-IMP clearance on dynamic lung scintigraphy was studied by two exponential compartments analysis in order to evaluate the effects of aging and smoking on the pulmonary function. Twenty-four patients (14 smokers and 10 non-smokers), referred for123I-IMP brain perfusion study underwent lung dynamic scintigraphy for 42 min immediately after123I-IMP injection. In the non-smoking group123I-IMP lung clearance was delayed with aging. A significant correlation was found between aging and clearance rate in the lung. There was also a significant difference between the clearance rates between smoker and non-smoker group. These findings suggest that smoking and aging affect the pulmonary function.
We studied the cerebral hemodynamics using Diamox99mTc-HMPAO SPECT in 9 patients with Moyamoya disease, consisting 4 children and 5 adults. Diamox99mTc-HMPAO SPECT studies were performed by the double injection method. Hypoperfusion areas were scored by a visual inspection as follows: ++; definite positive, +; probable positive, -; negative. Diamox test was interpreted as positive when the score increased over one degree. In the resting state, 6 out of 9 patients showed definite or probable positive hypoperfusion, while all of 9 patients showed a similar finding after Diamox injection. The Diamox test was positive in 6 out of 9 patients. It was positive in all 3 patients who showed a negative hypoperfusion in the resting state. The regional cerebrovascular response to Diamox was most severely impaired in the frontal region. However, it was relatively well preserved in the cerebellum and thalamus according to the semiquantitative analysis. Thus, the Diamox HMPAO SPECT was considered to be useful in evaluating of the hemodynamics in patients with Moyamoya disease.
Zeolite is an inorganic ion-exchanger that is widely used in chemistry, livestock and industry. The authors have tried to apply it to an eliminant for the incorporated radionuclides. In this study, several experiments in vitro and in vivo were carried out to evaluate the effectiveness of zeolite (A-3) in eliminating the incorporated137Cs from the body. 1. Experiments in vitro. Zeolite could adsorb 2.2 mmol of cesium ions per one gram of zeolite in cesium chloride solution. This value was only 44% of its ion-exchange capacity but it completely adsorbed137Cs within that limit. Coexistence of magnesium, calcium, manganese, cobalt and zinc ions hardly interfered with the adsorption of137Cs, but sodium, potassium and copper ions hindered the adsorption in proportion to their concentration. Therefore, sodium and potassium ions may be principal factors inhibiting the adsorption of137Cs in the intestinal tract. 2. Experiments in vivo. Biological half-life of137Cs was about 5.5 days in control mice. This half-life was significantly reduced to 5.2, 4.5 and 3.9 days by feeding the diet with 1%, 3% and 10% of zeolite, respectively. These results suggest the effectiveness of zeolite in eliminating the137Cs from contaminated persons.