最新刊期
      期 6 ， 2017

        RADIATION INTERDISCIPLINARY RESEARCH

      • Xun LU,Guoping SUI,Xuelian HANG,Pengde WANG,Rongrong SUN,Yao XIAO,Jianxin CHEN,Jun HUANG
        Vol. 35, Issue 6, (2017) DOI: 10.11889/j.1000-3436.2017.rrj.35.060701
        摘要：Results obtained by direct measurement of absorbed dose to water for medical electron accelerators were compared with that by indirect measurements (through converting the measured air kerma into absorbed dose to water). Experiments results demonstrate that the difference between two methods is within 1%, it is validated by the transfer comparison method meanwhile. It is demonstrated that the absorbed dose to water traceability system based on the photon absorbed dose to water for the accelerator is feasible. This provides the basis for direct measurement of absorbed dose to water for accelerators.  
        关键词：High energy photon;Absorbed dose to water;Correction factor for beam quality;Dissemination of the value of quantity;Traceability of value of quantity   
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        发布时间：2021-12-10

        RADIATION PHYSICS

      • Jinxiang SHOU,Xingyong GU,Yuqi ZOU,Zhaoquan ZHANG,Wugang FAN,Huanzhe TONG
        Vol. 35, Issue 6, (2017) DOI: 10.11889/j.1000-3436.2017.rrj.35.060801
        摘要：AlON:C transparent ceramics were prepared by pressureless sintering method with high purity α-Al2O3 powder and AlN powder as raw materials, and the same amount of carbon was incorporated into AlON transparent ceramics by atmosphere infiltration method, research the optically stimulated luminescence (OSL) performance of AlON:C transparent ceramics. The OSL decay curves of AlON:C transparent ceramics are exponentially decaying with time, fast at the beginning, and slowly later on. 470 nm blue light cannot empty the optically stimulated luminescence signal, which has a signal accumulation phenomenon. The OSL intensity response curves of AlON:C irradiated under β-ray irradiation are linear to sub-linear and tend to be saturated. The OSL response curve of AlON:C transparent ceramics for β-ray shows an excellent linear characteristic, respectively, in the range of 50 mGy~50 Gy and 50~100 Gy; in the range of 50~500 mGy, it shows an excellent linear characteristic to β-rays and γ-rays. The intensity of OSL under γ-ray irradiation is about 76% of that of OSL under β-ray irradiation.  
        关键词：AlON:C;β-rays;γ-rays;Optically stimulated luminescence   
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        发布时间：2021-12-10

        RADIATION PROTECTION

      • Yanfeng YE,Mai LU,Xiaoqiang CHEN
        Vol. 35, Issue 6, (2017) DOI: 10.11889/j.1000-3436.2017.rrj.35.060601
        摘要：The finite element software COMSOL was used to simulate the magnetic field effect of the body model under the typical cup type tower and cat-head type tower with 1 000 kV ultra high voltage (UHV) AC transmission lines. Magnetic induction intensity, induced electric field intensity, and the induced current density in body tissues for different towers were calculated, and the results were compared with the guidelines specified by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). The results indicated that the magnetic field in the human body model and its surroundings distributed uniformly, and the distribution of the magnetic induction intensity in the transversal distribution was a circular arc. The cup type tower and the cat-head type tower had the similar distribution in magnetic induction intensity, induced electric field intensity and induced current density in the human body. Maximum values of all induced data under the cup type tower were about 56.3%, 54.6%, and 55.2% of the cat-head type tower. Compared with the ICNIRP guidelines, all the results were at a lower level. The electromagnetic exposure generated by the cup type tower and the cat-head type tower will not pose a threat to the health of human body. From the perspective of electromagnetic exposure dosimetry, the cup type tower is better than the cat-head type tower.  
        关键词：Ultra high voltage AC;Magnetic field effect;Magnetic induction intensity;Induced electric field intensity;Induced current density   
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        发布时间：2021-12-10

        RADIATION TECHNOLOGY APPLICATION

      • Guojun JIA,Zhengui MA,Fengwu ZHAO,Xihong LU,Guirong WANG
        Vol. 35, Issue 6, (2017) DOI: 10.11889/j.1000-3436.2017.rrj.35.060401
        摘要：Strains of Cordyceps militaris grown in suspension culture were irradiated by 12C6+ ion beam, screened using the plate separation method, and re-screened by culturing fruiting bodies to determine the fruiting-body yield, polysaccharide and cordycepin content. The strains displayed the highest lethality, i.e., 82%, at the optimal absorbed dose of 150 Gy. Three mutants (G2, G5, G12) were obtained, which could produce a greater number of fruiting bodies. Meanwhile, the ten times pass-generation test indicated that the fruiting bodies stabilized at 8.02 to 8.21 g/bottle in these three mutants, which were 52.47% to 56.08% higher than the original strain, and the hereditary characters of these mutants were stable. The present findings show that a high-yield fruiting body of C.militaris can be obtained by mutation breeding using a heavy ion beam irradiation.  
        关键词：Cordyceps militaris;Heavy ion beams;Mutation breeding;Irradiation   
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        发布时间：2021-12-10
      • Zhongxiang LIU,Dapeng XU,Xiaorong LIAN,Wenqi ZHOU,Sirong KOU,Ze'en YAO
        Vol. 35, Issue 6, (2017) DOI: 10.11889/j.1000-3436.2017.rrj.35.060402
        摘要：Dry seeds of maize inbred lines LY8405 and PH6WC were irradiated by fast neutron at doses of 0.36~4.19 Gy to explore the cytological effect of irradiation on maize for germplasm innovation and improvement. The results showed that with the increase of absorbed doses, the mitotic index of root tip cells decreased, while the rate of nuclear aberration increased. The chromosome division behavior of irradiated inbred lines LY8405 in M1 generation was the most obvious at dose of 4.19 Gy, followed by the irradiated inbred lines PH6WC at dose of 2.48 Gy. Abundant mutation types appeared in M2 and M3 generation of inbred lines LY8405 and PH6WC under fast neutron irradiation, including those of plant shape, leaf color, panicle length, plant height, grain shape, and grain size, etc. Biological and cytological studies show that with maize seed irradiated by fast neutron at 0.36~4.19 Gy, the appropriate dose range for breeding is 2.48~4.19 Gy.  
        关键词：Maize;Fast neutron irradiation;Cytological effect;Progeny variation analysis   
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        发布时间：2021-12-10

        REVIEW

      • Yuhua MA,Youshi ZENG,Wei LIU,Yan LI
        Vol. 35, Issue 6, (2017) DOI: 10.11889/j.1000-3436.2017.rrj.35.060101
        摘要：The demand for accurate and efficient tritium monitoring is growing rapidly as tritium has become one of the major radionuclides in the environment. Conventional methods based on liquid scintillation counting require long measurement time and tens of grams to kilograms of sample material, which limits the high-precision measurement of small-sized samples. To rapidly determine tritium concentrations from milligrams of sample material and therefore enable the accurate and efficient measurement of small-size environmental samples, accelerator mass spectrometry (AMS) is used for tritium determination. Hence, AMS tritium measurement is widely used in earth science, biomedicine, and radiation monitoring. In this paper, the basic principles and development history of tritium measurement by accelerator mass spectrometry are reviewed, and the preparation methods for tritium samples are introduced. The key researches and main applications of tritium measurement using accelerator mass spectrometry are also summarized, with a view on future developments in this area.  
        关键词：Accelerator mass spectrometry;Tritium;Organically bond tritium   
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        发布时间：2021-12-10

        RADIATION CHEMISTRY

      • Mingcheng YANG,Zhenya ZHANG,Hongna ZHANG,Benshang ZHANG,Qingliang TIAN,Shubo LIU,Chao CHEN
        Vol. 35, Issue 6, (2017) DOI: 10.11889/j.1000-3436.2017.rrj.35.060302
        摘要：The biodegradable wheat straw powder/PBS[poly (butylene succinate)]-PBAT[poly (butylene adipate-co-terephthalate)] composites were prepared by melt-blending, wherein PBAT served as the toughening material. The composites were then subjected to γ-ray irradiation. The effects of PBAT content and different absorbed doses of 60Co γ-ray irradiation on the thermal properties, mechanical properties, and gel content of the wheat straw powder/PBS-PBAT composites were studied. The results showed that the impact strength of the composite increased by 13% when the mass fraction of PBAT was 30%. The mechanical properties and gel content of wheat straw powder/PBS-PBAT improved with increasing absorbed doses. The complete thermal decomposition temperature of the wheat straw powder/PBS-PBAT composite irradiated by 60Co γ-rays was 550℃, which increased by 50℃ or so.  
        关键词：Wheat straw powder/PBS-PBAT composites;Absorbed dose;Mechanical properties;Gel content;Thermal decomposition   
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        发布时间：2021-12-10
      • Guangxia QI,Xi ZHANG,Simeng ZHANG,Lei LI,Bangda WANG,Lianhai REN,Yi WANG,Wei WANG
        Vol. 35, Issue 6, (2017) DOI: 10.11889/j.1000-3436.2017.rrj.35.060301
        摘要：In order to realize the proper treatment of wastewater containing azo dyes, a silica-base supported BaF2-nano-TiO2 composite (hereinafter called the composite) was prepared by a three-step synthetic procedure and utilized for the decolorization and degradation of orange Ⅱ in aqueous solution. It was found that the irradiation time and solution pH value was important parameter that ensured the degradation effect of γ-rays at low dose. The optimal doping ratio of BaF2 to nano-TiO2 was determined to be 1:1 (mBaF2:mTiO2). Furthermore, it was found that a highly reductive atmosphere (N2) favored the formation of hydroxyl radicals (·OH), which were responsible for the efficient degradation and mineralization of orange Ⅱ. The decolorization rate of the orange Ⅱ, Reactive black 5 and Reactive blue 222 dyes solution by the radiocatalysis system was 96.8%, 95.3% and 99.9%, respectively; and total organic carbon (TOC) removal rate of the orange Ⅱ, Reactive black 5 and Reactive blue 222 dyes solution achieved 92.5%, 40.2% and 98.6%, respectively. Thus, it was shown that the composite could be applied to the treatment of wastewater containing azo dye mixtures. The results of this study extend the technical applications of the TiO2 photocatalytic oxidation technology.  
        关键词：Ionizing radiation;Radiocatalysis;Scintillator;Composite material;Azo dye   
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        发布时间：2021-12-10
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