[en] Using volume γ standard source (bottle) of mixed single energy nuclide and ¹⁵²Eu volume standard source (marineli beaker), two efficiency calibration curves of the HPGe γ spectroscopy were obtained and applied to the analysis of samples for comparison organized by the environment protection bureau of China in 1995. Satisfactory results have been gotten

[en] As the rapid development of nuclear technology, the safety supervision of nuclear and radiation becomes very important. The safety radiation frame system should be constructed, the safety super- vision ability for nuclear and radiation should be improved. How to implement effectively above mission should be a new subject of Provincial environmental protection department. Through investigating the innovation of nuclear and radiation supervision system, innovation of mechanism, innovation of capacity, innovation of informatization and so on, the provincial nuclear and radiation safety supervision model is proposed, and the safety framework of nuclear and radiation in Jiangsu is elementally established in the paper. (authors)

[en] The present situation of NORM residues arising from rare earths extraction and separation in Jiangsu Province has been investigated comprehensively. The management of these residues is discussed and analysed with respect to the separation technology, the activity concentrations, the amounts of residue generated and the regional eco-environmental features. Some conclusions and suggestions on the disposal of these NORM residues are given, with reference to the relevant national laws, regulations and standards. (author)

[en] The measuring method of gross α, gross β in solid is introduced in this paper, which covers the best thickness of the sample and variation coefficient of radioactivity concentration of the samples. The results show that using sample tray with diameter 45 mm, the optimized mass thickness is 10 mg/cm². For the actual sample measurement, the variation coefficient of radioactivity concentration of gross α in solid is 5.4%-11.4%, and gross β is about 2.8%-10.3%. Inter-lab comparative analysis of gross α and gross β in tea ash implies that the procedure work well. (authors)

[en] Objective: To study and establish the regulatory Limits of radiological protection for minerals associated with radionuclides. Methods: To deduce the limits according to the international and domestic references in combination with China's practices. Results: The regulatory Limits of radiological protection for minerals associated with radionuclides have been suggested. Conclusion: It is necessary and practical to establish the limits which are of great importance to the health of the public as well as the worker's

[en] This paper studied analytical method of strontium-90 in sea water, based on GB 6766-86 (Ra- diochemical analysis of Strontium-90 in water extraction chromatography by di-(2-Ethylhexyl) phosphoric Acid). The key to the study is the precipitation of seawater sample. The results showed that, the best precipitating agents for sea water strontium's measurement is the mixture of (NH₄)₂CO₃ and NH₄Cl; the radioactive recovery and the chemical recovery is between 30% and 50%, the uniformity is quite good; The detecable limit of this method is 4.1 x 10^-4 Bq/L, lower than the present strontium-90 radioactivity concentration in sea water by one order of magnitude. (authors)

[en] This paper summaries the implementation quality assurance programme for environmental background radiation investigation around Tianwan NPP. It includs organization and personnel, document control, traceability of data and instrument calibration, and quality control during the investigation process, quality record, self-check and verification. Finally, it gives the basic evaluation and existing problems. This paper stresses that a quality control is to prevent unqualification rather than prove the correctness in the process. (authors)

[en] Tianwan nuclear power plant (NPP) at Lianyungang, PR China is being in construction since 1999. To obtain the information of the ³H and ⁹⁰Sr background concentrations in different water bodies around the plant and offer the estimation of the influence after its launching, 170 samples of six water bodies of vapor, ground water, drinking water, surface water, rainwater and seawater were collected, and the background concentrations of ³H and ⁹⁰Sr in the water bodies are reported. The concentrations of ³H were found to vary in the range 0.5-4.8Bql^-1 with an average of 1.1+/-0.3Bql^-1, and the order is: vapor> rainwater> ground water> drinking water> surface water> seawater. The concentrations of ⁹⁰Sr were observed to vary in the range 1.1-19.3mBql^-1 with an average of 4.4+/-2.6mBql^-1. The average concentration order is: ground water> drinking water> surface water> rain water> seawater. Negative correlation is found between the concentrations of ³H and ⁹⁰Sr in different water bodies. The concentrations of the ⁹⁰Sr decrease in slow slopes, while the concentrations of ³H increase. The correlation in groundwater shows a large coefficient with a value of 0.62 due to the relative stable environment. The concentrations of ³H and ⁹⁰Sr are in accordance with the average level in the world. It indicates a low background radioactivity of ³H and ⁹⁰Sr in the vicinity of Tianwan NPP

[en] ¹³⁷Cs and ⁹Sr background levels in soil and plant around Tianwan Nuclear Power Plant (NPP) are reported. Eighty-four soil samples and 44 plant samples were collected from March 2000 to April 2002. The samples were analyzed by gamma spectrometry and radiochemical separation procedure to quantify ¹³⁷Cs and ⁹Sr radioactivities. The concentrations (Bq kg^-1 dry weight) have been observed in the range of 0.6-1.6 for ⁹Sr and 1.4-6.9 for ¹³⁷Cs in soils, their average values are 1.0 ± 0.3 and 4.6 ± 1.6, respectively, which are relatively lower than the reported values in neighboring countries. The mean concentrations (in Bq kg^-1 fresh weight except for tea and grass which is expressed in Bq kg^-1 dry weight) of ¹³⁷Cs and ⁹Sr are 0.1 ± 0.03 and 7.7 ± 4.1 in pine needle, 0.27 ± 0.05 and 3.0 ± 1.1 in tea, 0.65 ± 0.19 and 2.1 ± 0.3 in grass, 0.033 ± 0.021 and 0.084 ± 0.045 in wheat, 0.019 ± 0.01 and 0.23 ± 0.06 in China cabbage, and 0.009 ± 0.007 and 0.024 ± 0.084 in rice, respectively. The pine needle and tea can be regarded as indicator species for ⁹Sr and ¹³⁷Cs. The soil-to-plant transfer factor (TF) values of ⁹Sr and ¹³⁷Cs are, respectively, 0.022 and 0.031 for rice, 0.066 and 3.83 for China cabbage, 0.0088 and 0.089 for wheat, and 0.037 and 0.56 for grass

[en] The natural radioactivity of soils at the Xiazhuang granite massif of Southern China has been studied. The radioactivities of 55 samples have been measured with a low-background HPGe detector. The radioactivity concentrations of ²³⁸U and ⁴⁰K ranged from 40.2 to 442 and from 442 to 913Bq/kg, respectively, while the radioactivity concentration of ²³²Th varied only slightly. In order to evaluate the radiological hazard of the natural radioactivity, the radium equivalent activity (Ra_eq), the absorbed dose rate (D-bar ), the annual effective dose rate and the external hazard index (H_ex) have been calculated and compared with the internationally approved values. The study provides background radioactivity concentrations in a granite area, specifically, the area in the vicinity of a uranium mine in Southern China. The data can be used in exploring granite-type uranium deposits