[en] First, the development of the district centering around Tokai Village is mentioned, where at present Japan Atomic Energy Research Institute, Power Reactor and Nuclear Fuel Development Corporation, Japan Atomic Power Co. and others are located. Ibaraki Prefecture investigated the effects that atomic energy facilities exerted economically and socially to the district. As to the social environment investigation related to atomic energy facilities, its purpose, the objects of investigation, the contents and the method of investigation are reported. As to the progress of the development and utilization of atomic energy in Ibaraki Prefecture, 23 establishments are located in the district. Also there are 16 power reactors and research reactors, one fuel reprocessing plant, 4 nuclear fuel fabrication facilities, 86 nuclear fuel using facilities and 28 radioisotope using facilities. Their situations are reported. As to the atomic energy administration of Ibaraki Prefecture, the safety administration and the countermeasures for surrounding areas are explained. The effects exerted to the society and the economy of the district are reported. The results of the investigation of the conscience concerning atomic energy of residents are shown about energy and atomic energy, atomic energy administration, and the relation of atomic energy facilities with the district. (K.I.)

[en] This report describes the time series of author's experience at his Research Center. On September 30, he noticed the abnormality on the alarm of Funaishikawa monitoring station which showed an transient elevation at 10:38 of 2 min-dose rate to 0.4 μGy/h in both NaI detector and ionization chamber. He at 11:27 by phone from the atomic safety department of the prefecture office, actually knew the criticality accident of 10:35 at JCO and asked all personnel to be in the Center. Thereafter, the activities were: request for measuring radioactivity of soil and air; measuring radioactivity of city water source; faxing of dose rate data of monitoring stations to counter-planning headquarters; and arrangements of monitoring with national headquarters at Tokai JAERI. Continuous monitoring and consultation were done as well. The author pointed out, in conclusion, the importance of rapid detection of accidents, of legal national inspection of atomic facilities, of education of atomic energy and radiation for prefecture personnel and people, and of common recognition of official information. (K.H.)

[en] In Ibaraki prefecture, the tritium concentration in the drainage from the nuclear facilities has been measured since 1974. Then, with the start of operation of the fuel reprocessing plant in 1977, the tritium concentration in environmental samples was to be measured also in order to examine the effect of the drainage on the environment. The results of the tritium measurement in Ibaraki prefecture up to about 1980 are described: sampling points, sampling and measuring methods, the tritium concentration in the drainage, air, inland water and seawater, respectively. The drainages have been taken from Japan Atomic Power Company, Japan Atomic Energy Research Institute, and Power Reactor and Nuclear Fuel Development Corporation (with the fuel reprocessing plant). The samples of air, inland water and seawater have been taken in the areas concerned. The tritium concentration was measured by a low-background liquid scintillation counter. The measured values in the environment have been generally at low level, not different from other areas. (Mori, K.)

[en] Radioactivity in marine environment of Ibaraki Prefecture has been monitored since 1965. This report briefly describes the radiological survey data of marine sediments. The concentrations of radionuclides in marine water were determined yearly 4 times for ³H and twice for ⁵⁴Mn, ⁶⁰Co, ⁹⁰Sr, ⁹⁵Zr, ⁹⁵Nb, ¹⁰⁶Ru, ¹³⁷Cs and ¹⁴⁴Ce. The concentrations of ⁹⁰Sr, ¹³⁷Cs and ^239+240Pu were hardly changed and those of ⁹⁰Sr and ¹³⁷Cs were near the limit of identification. The annual excretion of radionuclides from major nuclear plants in Ibaraki Prefecture including JAERI (Tokai and Oarai), Japan Atomic Power Co., etc. were determined for ³H, ¹⁴C, ⁹⁰Sr, ¹³⁷Cs, ⁶⁰Co, ¹²⁹I and ^239+240Pu. Based on the results, dose equivalent for the intake of marine animals and algae was estimated to be as low as 0-4.4 μSv. This level was extremely lower than the limit of annual dose equivalent; 1000 μSv and it was kept nearly constant if the operators of those facilities were not discontinued for a long. To elucidate the factors related to the transfer of radionuclides into marine sediments, the depth dose distribution in marine sediments were investigated as well as the relation between radionuclide level and granular size. An elevation of ¹³⁷Cs level was found for the sediments composed of fine granules, which were rich in the sediments of offshore region. The ^239+240Pu level was positively correlated to the content of organic compounds in the sea. (M.N.)

[en] Angio computed tomography (CT) was performed in 87 previously untreated patients with endometrial carcinoma to study its clinical usefulness. All the patients subsequently underwent surgery and the angio CT findings were correlated with the surgical and pathologic findings. The results were as follows: 1. The tumor appeared as areas of low density in comparison with the surrounding myometrium after intraarterial infusion of contrast medium. 2. Angio CT proved to be useful in determining the depth of myometrial invasion. The myometrial invasion measured from the serosal surface in millimeters was assessed on angio CT. The CT findings were correlated well with pathologic findings. 3. Patients with intact myometrium greater than 10 mm from the serosal surface assessed by angio CT had no nodal metastases. Angio CT provides a better display of cross-sectional uterine pathology than CT after intravenous infusion of contrast medium. The depth of myometrial invasion measured from the serosa on angio CT seems to be a useful prognostic factor in patients with endometrial carcinoma. (author)

[en] Patients with uterine cervical cancer treated with both radical hysterectomy and postoperative adjuvant radiotherapy were studied restrospectively. The following points were indicated: Adjuvant radiotherapy (pelvic external irradiation) suppresses the intrapelvic recurrence and improves the cumulative survival rate. Adjuvant radiotherapy increases the onset of lymphatic edema in lower extremities, but no other severe complications occur. Indications of this adjuvant therapy are presence of nodal metastasis, adnexal metastasis, lymphatic permeations, and/or deep invasion into the cervical wall. For the cervical adenocarcinoma, adjuvant chemotherapy should be added to the operation. (author)

No abstract available

[en] A new remote-controlled underwater robot is developed for taking off marine organisms attached to the inside of inlet channel for power station. As oppose to most robot can be used in square shaped cross section of the culvert, this system can take it off attached inside the circular pipe with coating and move automatically. Evaluations of the performance of movement and cleaning are described in this report. (author)

[en] Since radiation therapy has been known to be a cause of bone atrophy (radiation osteopathy), it could be important whether postoperative radiotherapy in patients who have undergone oophorectomy further promotes bone mineral loss or not. Nineteen patients with stage Ib to IIb cervical cancer were studied. Eleven of the 19 patients received only surgical treatment and 8 received postoperative radiotherapy (50 Gy to the pelvis and 40 Gy to the lumber spine), because of the presence of advanced lesions or positive lymphnodes. A significant increase in FSH and decrease in E₂ (p<0.01) compared to before treatment were observed in both groups. A significant increase in serum alkaline phosphatase activities (p<0.01), urine-calcium/creatinine ratio (p<0.05) and urine-hydroxyproline/creatinine ratio (p<0.01), which indicated high bone turnover, compared to before treatment in both groups also appeared. Although these chemical parameters in both groups changed coincidentally, the decline in spinal bone mineral density in the irradiated group was delayed at 12 months after the treatment. On the other hand, there was no difference in the changes in femoral bone mineral density in the two groups. These results suggest that radiotherapy might inhibit the bone mineral loss at the irradiated bone site even when there was an estrogen lack. (author)

[en] To investigate the sequential changes in signal intensity (SI) of normal and abnormal uteri, T1-weighted images were taken repeatedly after the injection of Gd-diethylenetriaminepentaacetic acid (DTPA). Six volunteers and 19 patients with known uterine body malignancy (18 carcinomas, one carcinosarcoma) were examined. The results in volunteers were as follows. In the secretory phase, SI of the endometrium was stronger in the late images than in the early ones, whereas in the proliferative phase, SI was stronger in the early images. SI of the myometrium decreased rapidly and there were no differences in SI between menstrual phases. In 17 of 18 endometrial carcinomas, the tumors showed hypointensity relative to the myometrium, and the contrast between the tumor and the myometrium was better in the early images. In the remaining two cases, the tumor showed hyperintensity and the contrast was better in the late images. After the injection of Gd-DTPA, the endometrium appeared differently according to the menstrual cycle in normal volunteers, and the appearance of uterine structures and endometrial malignant tumors changed sequentially. These findings must be kept in mind when evaluating uterine diseases by Gd-DTPA enhanced MRI. (author)