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  • 28 August 2015 Volume 24 Issue 4
      
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  • Comparison of Individual Dose Anomalies in Certain Areas of China
    WANG Hong-bo, CHENG Xiao-qing, LI Xiao-liang, SUN Quan-fu
    2015, 24(4): 321-324. https://doi.org/10.13491/j.cnki.issn.1004-714x.2015.04.001
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    Objective To identify issues existing in the work of individual dose anomaly investigation and verification, and to improve individual monitoring. Methods Based on reports of investigation and verification on individual dose anomalies from 2003 to 2014 in some areas,the standard of determining dose abnormal staff,investigating ways,the percentage of individual dose anomalies in total individual monitoring,the percentage of real exposed people in individual dose anomalies were compared. Results By comparing,it was found that the period of individual monitoring,the standard of determining dose abnormal staff,investigating ways,the criterion for the classification types of occupational exposure are inconsistent. The percentage of individual dose anomalies in total individual monitoring were in the range of 0.2%~1.6%,the percentages of real exposed people in individual dose anomalies were in the range of 3.0%~57.1%. Differences among these areas are big. Conclusion Many problems exist in the work of investigation and verification of individual dose anomalies and these problems are to be handled. Joint efforts should be made to regulate the investigation and verification of individual dose anomalies to protect the health of radiation workers.
  • Formulation and Analysis of Reference Dose from CT Head Scanning in Shandong Province
    YANG Ke, LIU Yi, ZHANG Wei, YU Xi-rong, LI Lian-bo, ZHANG Xian-peng, LI Wei, XIA Chun-dong
    2015, 24(4): 325-327. https://doi.org/10.13491/j.cnki.issn.1004-714x.2015.04.002
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    Objective To formulate the level of reference dose from CT head scanning in Shandong Province for promoting its rationalization. Methods The results of doses are divided into 30 groups through measuring the CT dose index,the mean value for each group is chosen,and then the doses are ranked from low to high order,its value of 75% percentile is the reference dose level. Results Dose values of 75% percentile in two surveys,are 38.37mGy and 51.77mGy respectively. the absolute difference is 13.4mGy,and its value of the second survey has exceeded the value of 50mGy from protection standard, but less than the value of 60mGy given by ICRP. Conclusion With a large number of CT application,it is necessary to amend for new reference dose level,and it has obvious social benefits for establishing the reference dose level from CT Scanning.
  • Occupational Health and Security Protection of Workers on Nuclear and Radiation Emergency Rescue
    TANG Mu-tao, LI Qi-hui, WANG Qian, Gu Qia-min, ZHANG Hui-bin, WANG You-jin
    2015, 24(4): 328-331. https://doi.org/10.13491/j.cnki.issn.1004-714x.2015.04.003
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    Objective To study the protection strategies of workers' occupational health and security protection on nuclear and radiation emergency rescue. Methods Protection strategies are discussed from the major terms of emergency dose control, personal protection,education training and emergency management with the new concept such as reference levels under the new nuclear emergency response system framework. Results The application of the methods based on overall protection strategy is more reasonable than the practice and intervention system in ensuring the health of the rescue workers. Conclusion The protection strategies promoted provide necessary reference for emergency rescue,dose control and personal protection.
  • Investigation of Township Health Centers in Radiation Protection Status in Huizhou City
    ZENG Yun-liang, JIANG Shi-feng, CHENG Jin-peng, CHENG Bao-gen
    2015, 24(4): 333-335. https://doi.org/10.13491/j.cnki.issn.1004-714x.2015.04.005
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    Objective To master the current status of radiation protection in township health centers in Huizhou City to guarantee the health of the basic radiation workers and the public. Methods The facilities of radiation protection was investigated by field investigation method. The radiation workplace was detected by AT1123 radiation detector. Results No qualified management system is made. The qualified rate of protection articles is only 32.76%; the area of machine room is less than the national standard requirement,the qualified rate is 77.59%; the work state indicating lamp is not connected wiht is the protection door,the qualified rate is 78.31%; qualitied rate of power exhausting device 81.03%; qualified rates of useful wire harness oriectation,warning marks and the performance of equipment protection are higher respectively,93.10%,100% and 93.10%. The results of shielding protection testing 13 of township hospitals exceed the standard in varying different degree, the qualified rate is 83.75%. Conclusion The present situation of radiation protection in township health centers in Huizhou cityproblems shows serious,problems which is related with uneffective supervision and law enforcement,limitted economic conditions and weak personnel protection consciousness.
  • The Hazard Assessment of Indoor Radon Concentration of Harbin Engineering University
    PEGN Bang-bao, ZHANG Qing-wu, GENG Xin, CHENG Zhi-peng
    2015, 24(4): 375-377. https://doi.org/10.13491/j.cnki.issn.1004-714x.2015.04.022
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    Objective To understand the level and hazard assessment of Harbin Engineering University indoor radon concentration. Methods The study adopted two filter methods for continuous measurement of indoor radon concentration of Harbin Engineering University,and analyze the hazards of radon gas. Results The radiation to human body caused by indoor radon and its progeny in a year is 1.48 mSv,slightly higher than the average level the other parts of China. Conclusion The indoor radon concentration of Harbin Engineering University is in the higher range. Protective measures should be developed from the two aspects to block the source and dissipate indoor radon concentration in our everyday life.
  • Evaluation of the Radioprotection Efficiency Relating to the Application of 125I-Particle Implantation in A Hospital
    LI Wei, ZHAO Yang, ZHOU Yu-ping
    2015, 24(4): 398-400. https://doi.org/10.13491/j.cnki.issn.1004-714x.2015.04.031
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    Objective To evaluate the radioprotection efficiency relating to the application of 125I-particle implantation in a hospital to ensure the health and safety protection of radiological workers and the public. Methods The evaluation was done according to the national standard GBZ/T 181-2006 "Specifications for Compilation of Occupational Hazard Evaluation Report in Radiological Protection on Construction Project". Results The shield and safety protection of the 125I-particle meet the request of national standard. Conclusion The conclusion is that the health and safety protection of radiological workers and ambient public can be ensured when the radiotherapy center run in order.
  • Detection Efficiency of N-Type Coaxial HPGe for Measuring 131I in Iodine Collection Device
    HE Lin-feng, TANG Fang-dong, ZHUO Wei-hai, ZHAO Chao, XU Yi-he
    2015, 24(4): 408-411. https://doi.org/10.13491/j.cnki.issn.1004-714x.2015.04.034
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    The measurement standard which used for radioactive iodine monitor equipment reference response calibration is a 131I reference source which use radioactive iodine collection device as source carrier. Generally,the 131I reference source is quantified by using gamma spectrometer method. Therefore,the detection efficiency of gamma spectrometer for 131I in collection device is a key parameter in accurate quantification of 131I reference source. In this paper,we studied the detection efficiency of N-type coaxial HPGe with a relative detection efficiency of 53% for 131I in collection device. The results show that the gamma detection efficiency of this HPGe for 131I on glass fibrous filter or active carbon filter is 7.68%,and the gamma detection efficiency of this HPGe for 131I in different depth of impregnated activated carbon filter cartridge ranged from 3.14% to 7.68%. The ηcou·ηcol value ranged from 4.90% to 6.82%,while the distribution parameter changed from 0.09 mm-1 to 0.34 mm-1.
  • The Research on Whether Thermoluminescent Personal Dosimeter Called CTLD-J4000 Can be Used for Energy Discrimination
    ZHANG Lei, WANG Xing-gong, LI Gong-jie, HOU Jin-bing, LIU Xue-lin
    2015, 24(4): 411-414. https://doi.org/10.13491/j.cnki.issn.1004-714x.2015.04.035
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    Objective According to analysis metrological verification results of detectors which dispersity are ±1% to verify whether thermoluminescent personal dosimeter called CTLD-J 4000 can be suitable for the place of radiolo-gical diagnosis and radiotherapy of different energy. Methods Under the "Thermoluminescence Dosimetry Syste-ms Used in Personal and Environmental Monitoring for X and Gamma Radiation JJG593 -2006", the preparing thermoluminescent personal dosimeter was taken to The first class metering station of ionizing radiation of Science and Technology Industry of National Defense for the verification, and the results were analyzed. Results The linearity and the en-ergy response of thermoluminescence dosimetry system meet the demand of test specification. Specific val-ue of detetors determined which in the different groove of personal dosimeter can differentiate photon of different energy, and only if choosing calibration factors scientifically, can the effective dose be calculated. Conclusion Thermo-luminescent personal dosimeter called CTLD-J4000 can be suitable for identifying energy, and can be used to monitor personal dose in the the place of radiolo-gical diagnosis and radiotherapy of different energy.
  • Research and Application of Adsorbents for Removing Radioiodine from Dissolver off-Gas in Nuclear Fuel Reprocessing Plant
    LIANG Fei, LI Yong-guo, ZHANG Ji-rong, QIAO Tai-fei, WANG Kun-jun, WU Bo, ZHANG Qun
    2015, 24(4): 423-426. https://doi.org/10.13491/j.cnki.issn.1004-714x.2015.04.039
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    Objective The relationship of influence factors and adsorption properties of adsorbents were discussed. Methods Future resarch dirctons were given by reviewing the research and application of adsorbents for removing radioiodine from dissolver off-gas in nuclear fuel reprocessing plant. Results It shows that the silver-based adsorbents have better capability for removing radioiodine and are the currently preferred sorbents. Furthermore,in-process of aging,silver-exchanged mordenites have an advantage of possible generation to save cost and reduce radioactive waste. Silver-functionalized silica aerogels are suitable for direct conversion to waste form for long-term storage. Conclusion But their primary disadvantage is costliness of silver,therefore non-silver-based adsorbents and organic porous sorbent will have broad application future by development for iodine removal from dissolver off-gas (DOG) streams of nuclear fuel reprocessing plant.
  • Effects of Percutaneous Coronary Intervention on Sinus Heart Rate Turbulence in Patients with Unstable Angina Pectoris Complicated with Type 2 Diabetes Mellitus
    Li Hui-ying, Li Jing
    2015, 24(4): 434-436. https://doi.org/10.13491/j.cnki.issn.1004-714x.2015.04.043
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    Objective To explore the effects of PCI on sinus heart rate turbulence in patients with unstable angina pectoris (UAP) complicated with type 2 diabetes mellitus. Methods A total of 110 patients with UAP complicated with type 2 diabetes mellitus were selected,then were divided into 57 cases in the observation group and 53 cases in the control group. The two groups were given conventional treatment of UAP and diabetes. Among all the patients,dynamic electrocardiogram was done to calculate turbulence onset (TO) and turbulence slope (TS) before treatment and one month after treatment. Results TO was significantly lower and TS was significantly higher in the observation group at one month after PCI(P < 0.05). Compared with the control group at one month after PCI,TO was significantly lower and TS was significantly higher in the observation group(P < 0.05). TO was significantly lower and TS was significantly higher in multi-vessel group compared with that of single-vessel group(P < 0.05). Conclusion PCI can more effectively improve HRT in patients with UAP complicated with type 2 diabetes mellitus. Patients should undergo PCI therapy to improve the long-term prognosis.
  • Analysis of Clinical Efficency of X-ray Guided Interventional Treatment of 28 Cases With Uterine Myoma
    ZHANG Xin-yi, DENG Bo
    2015, 24(4): 437-439. https://doi.org/10.13491/j.cnki.issn.1004-714x.2015.04.044
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    Objective To explores the clinical curative effect of X-ray guided interventional treatment of fibroids. and evaluates its clinical application effect to provides a reference for future clinical treatment. Methods This study analyzes the clinical data of 28 fibroid cases retrospectively who were treated in our hospital from March 2010 to March 2013. All patients are performed X-ray guided interventional treatment. The study observes and records the patients' volume of uterine and fibroid,menstruation,hormone levels,the postoperative complications etc. before and after the treatment. Results Patients are reexamined one time every three months after the surgery. It is found that the patients' postoperative uterine volume and fibroid volume are significantly smaller than preoperative volume(P < 0.05). The differences are statistically significant. The postoperative menstrual cycle,menstruation,menstruation time are significantly better compared with the preoperative situations(P < 0.05). The differences are statistically significant. The postoperative LH,E2,FSH levels have no significant changes than the preoperative levels(P > 0.05). The differences are not statistically significant. There appear one temporary amenorrhoea case,one vomit case and one hematuria case within 3~5 days after the treatment. The symptoms disappear after having been perform the symptomatic treatment for 1 week. Serious complications,such as pelvic infection,did not appear. Conclusion X-ray guided interventional treatment for patients with fibroid can improve the clinical symptoms effectively. It has many advantages such as smaller trauma,faster postoperative recovery,fewer complications,high safety etc. Its curative effect is remarkable. It is worthy to be applyed and promoted widely in clinical practices.