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目的 按国家标准对广东省11台医用电子直线加速器机房屏蔽防护效果进行评价。方法 对加速器机房控制室操作处和机房外30 cm处环境X-γ辐射剂量率进行监测,并与机房辐射剂量率设计值进行比较。结果 各加速器机房监测符合国家辐射防护要求。结论 定期对加速器机房进行屏蔽防护监测,是确保辐射安全的简单有效方法。 相似文献
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目的 计算BJ-14型医用电子加速器机房的屏蔽墙厚度并对屏蔽效果进行评价。方法 依据《医用电子加速器卫生防护标准》。结果 计算出各防护墙的厚度,并按最优化原则提出建议值。结论 按建议值施工降低了工程费用,防护效果符合国家标准。 相似文献
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目的 调查评价湖北省医用加速器的放射防护情况。方法 按国家相关标准对湖北省在用的35台医用加速器进行检测评价。结果 医用加速器机房的屏蔽防护均能达到要求,加速器的卫生防护总体合格率为74%,主要不合格项目为辐射野内均整度和不对称性,经过维修调试后,能达到国家标准的要求。结论 对医用加速器的防护设施应坚持进行预防性监督,对加速器的卫生防护应进行定期的稳定性检测和状态检测。 相似文献
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医用电子直线加速器性能及卫生防护安全评价 总被引:2,自引:0,他引:2
目的 对医用电子直线加速器性能及工作场所,邻近环境进行评价。方法 依据GB 15213-94医用电子直线加速器性能和试验方法及GBZ126-2002医用电子直线加速器放射卫生防护标准所规定的方法进行检测评价。结果 检测指标,如重复性、高剂量后稳定性、均整度、对称性、半影、剂量线性、机房屏蔽及周围邻近环境等指标均符合国家标准。结论 型号为PRIMUS的医用电子直线加速器主要性能指标测试结果和机房屏蔽及周围邻近环境的安全防护性能符合要求,对工作人员及公众无危害,属安全性工作。 相似文献
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目的 对医用加速器机房通风系统进行研究,提出改进方案并对改进方案进一步说明。方法 通过对机房内有害气体产生的部位、特点、排风方式的研究分析,对新改进方案的详细介绍,说明新改进方案的优点和可行性。结果 现在的医用加速器机房通风系统存在诸多不合理之处,而新改进方案具有明显的优点并切实可行。结论 新设计的医用加速器机房通风系统合理实用,值得推广。 相似文献
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C L Rümke 《Nederlands tijdschrift voor geneeskunde》1985,129(51):2469-2471
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Trends in meningococcal disease in Italy in 1988 总被引:1,自引:0,他引:1
Meningococcal disease in Italy decreased 15% in 1988 from the previous year (290 vs. 342 cases). The decline was particularly evident in military cases (1.7/100,000 in 1988 vs. 5/100,000 in 1987) reflecting the full coverage of bivalent serogroup (A + C) meningococcal polysaccaride vaccine in army recruits, achieved since January 1988. The highest proportion of cases was seen in people older than 25 years of age (25%). Serogroup C constituted 60% of the isolates, while 19% belonged to serogroup B. The proportion of strains resistant to sulphonamides was 45%, while 15% were resistant to Minocycline and none to Rifampin. Out of the five military cases, only one (due to serogroup C) was attributable to the vaccine failure. A single coprimary case, but no secondary cases occurred among civilians. These findings are consistent with the trends reported in Italy in the previous years. 相似文献
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Leon Braier Ashley Levy Klaus Dror Asher Pardo 《American journal of industrial medicine》1981,2(2):119-123
Determinations of benzene concentration in blood and of phenol in urine were made by head-space gas chromatography techniques on samples taken near the end of the work day from two groups of workers potentially exposed to low levels of benzene in the work-place atmosphere. Preliminary results suggest that benzene in blood is more reliable than phenol tests for assessing both exposure and uptake of benzene. Normal values of phenol in urine (10 mg/liter or less) were found in nearly all those cases in which benzene was detected in the blood. 相似文献
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AIMS: Health expectancy represents the average lifetime in various states of health and differs among social groups. The purpose of the study was to determine trends in social inequality in health expectancy since 1994 between groups with high, medium and low educational levels in Denmark. METHODS: The study was based on data from nationwide registers on educational level and mortality during the period 1994-2005 and data on health status derived from the Danish Health Interview Surveys carried out in 1994, 2000 and 2005. Expected lifetime in self-rated good and poor health, lifetime without and with longstanding illness and expected lifetime without and with long-lasting difficulties or restrictions were estimated by Sullivan's method. RESULTS: Between 1994 and 2005, life expectancy at age 30 years increased by 1.9 years for men and 1.5 years for women with a low educational level. For people with a high educational level, the increase was 2.7 years for men and 2.2 years for women. The difference between people with low and high educational level in expected lifetime in self-rated good health increased by 2.0 and 1.3 years for 30-year-old men and women, respectively. The social gap also increased for other indicators. CONCLUSIONS: During the past 12 years, social inequality in life expectancy and health expectancy has increased in Denmark, but the proportion of the population with a low educational level has decreased. 相似文献
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恶性肿瘤已成为中国居民的主要死因之一。近些年来,中国政府积极推进肿瘤预防和控制领域的研究工作,取得了很大的进步。本文简要汇总中国在肿瘤流行病学领域的研究进展,具体包括2019年的肿瘤负担、癌症危险因素及其干预、筛查和早期发现、癌症防治专项行动(2019-2022年)方案等方面,以期为我国肿瘤防治工作的有效开展提供技术支撑和理论依据。 相似文献
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目的 了解绵阳市2012年市售蔬菜中农药残留情况,为食用蔬菜监管提供依据.方法 全部样品均按照GB/T 5009-2003的方法进行农药的残留检测.依据GB 2763-2005《食品中农药最大残留限量》进行判定.结果 2012年共检测蔬菜165份,农药检出率和超标率分别为72.12%和23.64%.豆类、根茎类、叶菜类、瓜果菜类和食用菌类蔬菜检测农药残留超标率分别为8.00%、23.53%、36.00%、5.26%和27.03%,差异有统计学意义(x2=11.41,P<0.01).不同种类农药超标率差异有统计学意义(x2 =62.42,P<0.01).夏季和冬季蔬菜农药超标率差异无统计学意义(x2=3.44,P>0.05).结论 绵阳市叶菜类蔬菜中农药残留情况较为严重,应采取有效措施,加强蔬菜的监督管理,从源头禁止高毒农药的使用,加大蔬菜种植、销售环节的监测,确保市民食用蔬菜的安全. 相似文献