2011-03-11日本福岛核电站放射性物质发生泄漏事件,本研究基于MASNUM(Laboratory of Marine Science and Numerical Modeling)海洋环流模式,建立了西北太平洋海洋放射性物质输运扩散模式,对事故释放的^(137)Cs在海洋中的输运和扩散过程...2011-03-11日本福岛核电站放射性物质发生泄漏事件,本研究基于MASNUM(Laboratory of Marine Science and Numerical Modeling)海洋环流模式,建立了西北太平洋海洋放射性物质输运扩散模式,对事故释放的^(137)Cs在海洋中的输运和扩散过程进行了20a的模拟与预测。根据与观测资料的比较,验证了所建立的模式具备模拟放射性物质在海洋中的输运扩散过程的能力。结果显示:至2015年,^(137)Cs表层活度浓度已经扩散至整个中国海域,活度浓度值在0.01Bq/m^3左右;事故发生10a后,研究海域^(137)Cs表层活度浓度趋于均匀,为0.20~0.60Bq/m^3左右;20a后,^(137)Cs在海洋表层的活度浓度要小于0.15Bq/m^3。垂向扩散的结果显示:事故发生10a后,黄海海域^(137)Cs垂向分布较为均匀,东海东部陆架海域活度浓度高于西部海域,且上层海水中^(137)Cs活度浓度高于底层海水,南海北部海域^(137)Cs活度浓度高于南部海域,且略小于黄海和东海;至2030年,中国近海^(137)Cs的活度浓度的垂向分布趋于均匀,南海略高于黄海和东海;日本海^(137)Cs活度浓度主要集中在表层,最大活度浓度出现在2016年,约为0.20Bq/m^3;西北太平洋海域^(137)Cs活度浓度要高于其他4个海域;2030年以后,整个海域^(137)Cs活度浓度在水平和垂向分布均趋于均匀,均小于0.15Bq/m^3。展开更多
OBJECTIVE To analyze and compare the survival rate for stages Ⅱ and Ⅲ cervical cancer treated by external irradiation plus ^137Cs or ^192Ir. METHODS The patients with cervical cancer were treated by external irradia...OBJECTIVE To analyze and compare the survival rate for stages Ⅱ and Ⅲ cervical cancer treated by external irradiation plus ^137Cs or ^192Ir. METHODS The patients with cervical cancer were treated by external irradiation plus ^137Cs (group A, 427 patients) or plus ^192Ir (group B, 156 patients). There were 170 stage Ⅱ cases and 413 stage Ⅲ cases. The number of cancer types were as follows: squamous cell carcinoma, 524; adenocarcinoma, 34; and adenosquamous cell carcinoma, 25. The two groups received the same external irradiation using 8 or 10 MV of X-ray. After the whole pelvis received 25-35 Gy, the focus was given a total of 45-55 Gy by four divided fields. Intracavitary irradiation was performed with one fraction of 6-7 Gy in reference dose at A point every week and a total dose of 40-60 Gy with 6-8 fractions for group A; every fraction of 5-6 Gy in reference dose of A point and total dose of 30-42 Gy with 5-7 fractions for group B.RESULTS The 5-year survival rate of stage Ⅱ and Ⅲ, and total were 82.9%, 62.2%, and 67.2% for group A respectively and 85.1%, 61.5% and 69.2% for group B respectively. There were significant differences between stage Ⅱ and Ⅲ in each group (P< 0.05) but there were no differences in the 5-year survival rate between the two groups (P> 0.05). The late complications of the therapy were rectitis and urocystitis and with an incidence rate of 7.3% and 6.3% for group A and 9.6% and 9.0% for group B (P> 0.05). CONCLUSION The long-term survival rate and complications of stages Ⅱ and Ⅲ cervical cancer are similar when treated with external irradiation plus ^137Cs or plus ^192Ir.展开更多
文摘2011-03-11日本福岛核电站放射性物质发生泄漏事件,本研究基于MASNUM(Laboratory of Marine Science and Numerical Modeling)海洋环流模式,建立了西北太平洋海洋放射性物质输运扩散模式,对事故释放的^(137)Cs在海洋中的输运和扩散过程进行了20a的模拟与预测。根据与观测资料的比较,验证了所建立的模式具备模拟放射性物质在海洋中的输运扩散过程的能力。结果显示:至2015年,^(137)Cs表层活度浓度已经扩散至整个中国海域,活度浓度值在0.01Bq/m^3左右;事故发生10a后,研究海域^(137)Cs表层活度浓度趋于均匀,为0.20~0.60Bq/m^3左右;20a后,^(137)Cs在海洋表层的活度浓度要小于0.15Bq/m^3。垂向扩散的结果显示:事故发生10a后,黄海海域^(137)Cs垂向分布较为均匀,东海东部陆架海域活度浓度高于西部海域,且上层海水中^(137)Cs活度浓度高于底层海水,南海北部海域^(137)Cs活度浓度高于南部海域,且略小于黄海和东海;至2030年,中国近海^(137)Cs的活度浓度的垂向分布趋于均匀,南海略高于黄海和东海;日本海^(137)Cs活度浓度主要集中在表层,最大活度浓度出现在2016年,约为0.20Bq/m^3;西北太平洋海域^(137)Cs活度浓度要高于其他4个海域;2030年以后,整个海域^(137)Cs活度浓度在水平和垂向分布均趋于均匀,均小于0.15Bq/m^3。
文摘OBJECTIVE To analyze and compare the survival rate for stages Ⅱ and Ⅲ cervical cancer treated by external irradiation plus ^137Cs or ^192Ir. METHODS The patients with cervical cancer were treated by external irradiation plus ^137Cs (group A, 427 patients) or plus ^192Ir (group B, 156 patients). There were 170 stage Ⅱ cases and 413 stage Ⅲ cases. The number of cancer types were as follows: squamous cell carcinoma, 524; adenocarcinoma, 34; and adenosquamous cell carcinoma, 25. The two groups received the same external irradiation using 8 or 10 MV of X-ray. After the whole pelvis received 25-35 Gy, the focus was given a total of 45-55 Gy by four divided fields. Intracavitary irradiation was performed with one fraction of 6-7 Gy in reference dose at A point every week and a total dose of 40-60 Gy with 6-8 fractions for group A; every fraction of 5-6 Gy in reference dose of A point and total dose of 30-42 Gy with 5-7 fractions for group B.RESULTS The 5-year survival rate of stage Ⅱ and Ⅲ, and total were 82.9%, 62.2%, and 67.2% for group A respectively and 85.1%, 61.5% and 69.2% for group B respectively. There were significant differences between stage Ⅱ and Ⅲ in each group (P< 0.05) but there were no differences in the 5-year survival rate between the two groups (P> 0.05). The late complications of the therapy were rectitis and urocystitis and with an incidence rate of 7.3% and 6.3% for group A and 9.6% and 9.0% for group B (P> 0.05). CONCLUSION The long-term survival rate and complications of stages Ⅱ and Ⅲ cervical cancer are similar when treated with external irradiation plus ^137Cs or plus ^192Ir.
