[en] Based on monitoring results of delayed neutrons from reactor first circle water, the leakage of reactor fuel elements is monitored. A monitoring equipment consisted of an array of ³He proportional counter tubes with 75 s delay has been developed. The neutron detection efficiency of 6.1% is obtained

[en] Based on the characteristics of ⁶Li glass scintillator which is sensitive to both neutron and gamma rays, and ⁷Li glass scintillator which is sensitive to gamma rays only, a new method of detecting weak neutron flux under interference of strong gamma radiation has been investigated by means of ⁶Li-⁷Li pair glass scintillator gamma compensation method. The result of neutron flux measurement by above-mentioned method with an error of about 1% when the gamma ray interference is up to 18.7% has been obtained

No abstract available

[en] Based on the characteristics of ⁶Li glass scintillator which is sensitive to both neutron and gamma rays, and ⁷Li glass scintillator which is sensitive to gamma rays only, a new method of detecting weak neutron flux under interference of strong gamma radiation has been investigated by mans of ⁶Li-⁷Li dual glass scintillator gamma compensation method. The result of neutron flux measurement by above-mentioned method with an error of about 1% when the gamma ray interference is up to 18.7% has been obtained

[en] Objective: To occumulatle experience of anti-infection treatment in acute radiation sickness (ARS) induced by medical treatment in order to provide beneficial help for victims of accidental of acute radiation sickness. Methods: The changes of peripheral blood indices, body temperature and clinical symptoms of 17 cases who were clinically irradiated with 6.0-7.2 Gy X-rays were observed both before peripheral blood stem cell transplantation(PBSCT) and after anti-infection treatment. Results: WBC count began to decrease to below 1 x 10⁹/L from the 8th to 10th days after irradiation and maintained at row level for 4 days or for 13.3 days if the patients had not received rhG-CSF treatment. In 29.4% of patients the body temperature was higher than 38.5 degree C. After comprehensive enviromental protection and anti-infection treatment, all patients could successfully tide over the period of bone marrow depression without appearance of the typical critical phase of ARS. Conclusion: PBSCT and rhG-CSF treatment can reduce the time span for reconstruction of bone marrow. Comprehensive enviromental protection and combined anti-infection treatment are key points fm successful treatment. (authors)

[en] A new depth neutron moisture meter BH5047 has been developed. BH5047 neutron moisture meter is characterised by it is high sensitivity and used for sand water content measurement at concrete mixer. Calibration function is obtained by the Method of Least Squares. Linear correlation efficiency is as good as 0.9977

[en] Cadmium ratio meter based on ³He proportional counter tube as neutron detector has been developed. The cadmium ratio of 8.9:1 for Am-Be neutron after 10 cm polyethene moderator has been obtained

[en] A high-sensitive equipment monitoring leakage of the reactor fuel elements has been developed. The delayed neutrons emitted from fission product-pioneer nucleus are monitored in the 1st circle water. An array of ³He proportional counter tubes is designed as a neutron detector for delayed neutrons, the detection geometry of which is near to 4π. In order to reduce the influence of interference factors the monitoring of fission product is carried out with 75s delay. The ⁸⁷Br delayed neutron pioneer nucleus is chosen as a monitoring object. The neutron detection efficiency of the developed equipment is 6.1%, which is 3 times higher than one of all available advanced equipment of the same function both at home and abroad

No abstract available

[en] A direct method is developed to assay ⁹⁰Sr-⁹⁰Y in liquid radiowaste samples by Cherenkov counting without any chemical separation. Since the most interfering nuclides existing in liquid radiowaste have poor counting efficiencies, their Cherenkov contribution can be corrected by HPGe γ-spectrometry. The ⁹⁰Sr-⁹⁰Y contents are determined for 10 kinds of liquid radiowaste samples and radiochemically analyzed for comparison. The results show that this method is competent for most liquid radiowaste samples