[en] Determination of Sc and Th in ScI₃-NaI-ThI₄ sample is studied by X-ray fluorescence and complexometry. The effect of working condition of Sc on X-ray fluorescence spectrometer and different sample-making method on the determination of Sc and Th are studied experimentally. The X-ray fluorescence analysis of determination of Sc and Th is developed by polyester film sample-making technique, the measuring precision of Sc and Th is better than 4%. The effect of acidity and temperature on the determining end point of titration is obvious. The results of different complexometric methods are compared. The precision of Sc and Th is less than 2% by comlexometry, it is fit for the routine analysis of ScI₃-NaI-ThI₄ sample

[en] A new procedure of analyzing ⁹⁰Sr in soils was developed. The main procedures consist of three basic steps: oxalate precipitation to remove bulk potassium, chromatographic separation of Sr from most inactive and radioactive interferences and determination of radioactivity by liquid scintillation spectrometry. When ⁹⁰Sr was determinate, ⁹⁰Y newly growing must be deducted at the same time either by decaying time correction or by dual labeling. Procedures and manipulations were simplified, and the separation and determination can be carried out in 12 h. The chemical yield is about 80%, and the minimum detectable activity by this technique is about 20 Bq/g. (authors)

[en] Half-life of krypton-88 is 2.84 hours, high fission yields and a relatively large gamma branching ratio is had. The gas is short-lived fission products in burnup measurements. Only New fission products can extract from extraction in gas of fissile irradiation target. But krypton-88 with krypton-85, krypton-87, xenon -135, and xenon-138 is coexisted together, thus radiochemical separation must quickly taken. selected the irradiation time is 1-2 hours and cooling time is best 2 hours for sample preparation, krypton and xenon were separated using activated carbon adsorption, the ratio of krypton and xenon were measured by gamma spectroscopy. Then according to the ratio of krypton-85 and xenon-125 count rate coefficient around separation were calculated yield of krypton and decontamination factor of xenon and the final the yield of krypton-85 is calculated. (authors)

[en] Nuclear and radiochemistry is one of the fundamental subjects to ensure the national nuclear security and sustainable development of nuclear energy. The main achievements of the past 70 years, acquired by China Institute of Atomic Energy in the field of nuclear and radiochemistry were introduced in this paper. Especially, the technical progress in the separation and determination of long-lived nuclides, fast radiochemical separation of short-lived nuclides, fission chemistry, coordination chemistry of actinides and analysis of ⁹⁰Sr, were summarized in this paper. Furthermore, the emphasis and direction for future study were proposed at the end of this paper. (authors)

[en] To precisely measure the decay parameters of "1"4"2La, the prepared "1"4"2La sample must have high activity, high abundance and be free from carrier. A separation procedure with three steps was proposed to prepare the sample from fission products. In order to receive optimal results, the decay relationship of mother-daughter nuclides in the 142 mass chain and the differences of their independent fission yields need to be taken into account. The established three-step chemical procedure involves one BaCl_2 · 2H_2O precipitation and two HDEHP extraction chromatographic separations. A specialized set of equipment was created and used to fast radiochemically separate the "1"4"2La in batches. As a result, the total separation lasts about 20 min, and the chemical recovery rate is about 80%. The decontamination factors for other nuclides are greater than 10"3, and the activity ratio of "1"4"2 La to "1"4"1La is more than 3.5. (authors)

[en] For accurately measurement of the decay data of ⁹¹Sr, the prerequisite was to obtain pure ⁹¹Sr specimens. Based on the analysis of parent-daughter relationships in the three relevant fission product decay chains, a two-step delayed chemical separation procedure for rapid isolation of ⁹¹Sr from neutron-irradiated ²³⁵U sample was developed. Two types of dicyclohex-ano-18-crown-6 extraction chromatographic resins were prepared with Kel-F powder and Amberlite XAD-7, respectively, as support. Sr can be rapidly and quantitatively absorbed on both resins and easily eluted from them with deionized water. A corresponding sub-rapid separation device was manufactured in which two delayed extraction chromatographic columns in series were incorporated. The usefulness of the procedure and device was verified by using real fission products solution obtained by dissolution of neutron-irradiated ²³⁵U. The whole process is completed within 200 s. The ⁹¹Sr product is radioactively pure, with an overall recovery better than 90%. The decontamination factor is greater than 10² for ⁹²Sr, and better than 10³ for other radionuclides. The quality of ⁹¹Sr. specimens thus prepared can meet the requirements for its decay data measurements. (authors)

[en] Objective: To explore the optimal parameters of high pressure injector in performing interventional angiography and therapy of different parts of body in order to improve the image quality. Methods: During the period from July 2009 to September 2010 interventional angiography or therapy of different parts of body with the help of high pressure injector was performed in 692 patients, including 538 males and 154 females with a mean age of (53.6±2.5) years. The clinical data were retrospectively analyzed. The angiographic regions included vessels (n=341), cerebral vessels (n=71), thoracic larger vessels (n=19) and the vessels of the arms and legs (n=203). The technical parameters and the image qualities were evaluated and analyzed. Results: Based on the contrast filling degree, the presence or absence of contrast reflux, the imaging resolution and the satisfactory degree in meeting the diagnostic requirements, the angiographic images were evaluated. The image quality was up to standard in 615 cases (88.7%). Unsatisfactory contrast filling with no contrast reflux was seen in 62 cases (9.0%), and poor vascular opacification with contrast reflux was found in 9 cases (1.3%). Vagueness of the images caused by the body movement during exposure was seen in 6 cases (0.8%). No accidental events occurred in all procedures. Conclusion: The use of appropriate catheter, equipment and reasonable injecting parameters, which can match the characteristics of the target lesions, is the key to provide physicians with reliable angiography images. (authors)

[en] An effective method is found that ⁹⁰Sr and ⁹⁰Y can be measured by measuring the bremsstrahlung produced in a ⁹⁰Sr and ⁹⁰Y sample. According to the metrical principle, the detection efficiency ratio k of ⁹⁰Y to ⁹⁰Sr is obtained by measuring a ⁹⁰Sr sample from which ⁹⁰Y has been removed by extraction of ⁹⁰Y with di (2-ethylhexly) phosphoric acid (HDEHP). The results indicate that the simultaneous measurement of ⁹⁰Sr and ⁹⁰Y is feasible and ⁹⁰Sr-⁹⁰Y can be directly used as the tracer of Y. (authors)

[en] 75 mg (NH₄)₆Mo₇O₂4 · 4H₂O solution was irradiated for 20 min in miniature neutron source reactor (MNSR) and cooled for 12 min. In the conditions of 0.8 mol/L HNO₃, phase ratio 1:1, the solution of ¹⁰¹Tc sample was extracted twice with α-benzoin oxime/ethyl acetate phase to remove ¹⁰¹Mo and a radiochemically pure and carrier-free ¹⁰¹Tc product was obtained. The half-life of ¹⁰¹Tc was accurately measured with a HPGe γ-detector by following 306.8 keV γ-ray about 150 min, and processed the data by three methods, R-value method, iterative method and translation method. Five parallel measurments gave a half-life (14.02 ± 0.01) min (n=5) for ¹⁰¹Tc. (authors)

[en] A procedure of "1"0"1Tc was developed: 0.5 mL 150 g/L (NH_4)_6Mo_7O_2_4 solution was hot-sealed in the PVC vial and irradiated for 20 min in MINR. Cooled for 12 min after irradiation, the solution was mixed with 3.5 mL 1.0 mol/L HNO_3 in a separatory funnel. Then 4 mL 40 g/L α-benzoin oxime/ethyl acetate solution was added and extract 1 min. After 2 min, the organic phase was discarded. Then repeated once. A no-carrier and radiochemical pure "1"0"1Tc solution was obtained. The chemical recovery of "1"0"1Tc was more than 85%, the decontamination factor of "1"0"1Mo was more than 10"4. The γ-ray of "1"0"1Tc was determinated continuously by a HPGe γ detector by a place-replay method. A half-life of "1"0"1Tc, 14.025 ± 0.009 min, was given in 1δ. (authors)