A DYNAMIC FOOD CHAIN MODEL FOR HONG KONG BASED ON RADFOOD MODEL AND BIRCHALL—JAMES ALGORITHM

In this paper a dynamic food chain model for Hong Kong which simulates the transfer of radioactive substances from a fallout deposition via the food chain into the human bodies is built.The model is based on the RADFOOD model and the Birchall-James algorithm.The radionuclides ^131I and ^90Sr representing the short-term and long-term risk situations have been studied as sample cases.Various types of crops,and the dietary pattern of the public have been considered.The resulting internal radiation doses have been calculated.The results are obtained for food consumption starting at various time after the fallout deposition and for different consumption durations.     

STATUS ON A—CHAIN NUCLEAR STRUCTURE AND DECAY DATA EVALUATION IN CHINA

Chinese Nuclear Data Center is one of the members of International Nu-clear Structure and Decay Data Network,and is primarily responsible for eval-uating and updating nuclear structure and decay data for mass chains A=51～56 and A=195～198,and temporarily for evaluating them for A =170 and 172.A summary of the current evaluation status is given as follows,     

STUDY ON RESIDUES OF ~（14）C－FENITROTHION IN MODEL RICE－FISH ECOSYSTEM AND FIELD RICE－FISH ECOSYSTEM

ＳＴＵＤＹＯＮＲＥＳＩＤＵＥＳＯＦ~（１４）Ｃ－ＦＥＮＩＴＲＯＴＨＩＯＮＩＮＭＯＤＥＬＲＩＣＥ－ＦＩＳＨＥＣＯＳＹＳＴＥＭＡＮＤＦＩＥＬＤＲＩＣＥ－ＦＩＳＨＥＣＯＳＹＳＴＥＭＺｈａｎｇＺｈｏｎｇｌｉａｎｇ（张仲良）；ＷａｎｇＨｕａｘｉｎ（王化新）；Ｇ?..     

混合制剂对~(131)I、~(134)Cs、~(85)sr 的阻吸收效果和毒性观察

本文主要介绍由碘化钾、普鲁士兰、海藻酸钠、磷酸铝和鸡内金水煎剂等药物配制成的混合制剂对大鼠体内~(131)I、~(134)Cs 和~(85)Sr 等核素的阻吸收和促排效果及其对大鼠和犬的毒性的观测结果。实验结果表明,所用混合制剂对上述核素有较好的阻吸收和促排效果;混合制剂使大鼠的摄食量有所减少,体重增长受到影响;在对犬的试验中未见明显的毒性作用。     

用Calyculin A诱导的PCC断片率检测甲状腺癌患者131I治疗中染色体损伤程度

采用Calyeulin A诱导的染色体凝聚断片率来检测甲状腺癌患者接受^131I治疗过程中染色体损伤程度,并与常现法染色体双着丝粒体畸变率进行了比较研究。结果表明,Calyeulin A法PCC断片率能更真实地反映^131I治疗后患者染色体受损程度。     

空气中^131I的取样和测量方法的研究

本文介绍一种气态和气载~(131)I 取样器。着重介绍了一种指数分布源的效率刻度方法,讨论了与取样有关的一些问题。     

核电厂模拟器稳压器数学模型的研究

对北京核电厂模拟培训中心的压水堆模拟器稳压数学模型作了改进。原稳压器数学模型采用修正的平衡态模型，对于快速瞬变过程，不能满足模拟的逼真度要求。改进后的模型采用三区非平衡态模型，考虑了稳压器内汽泡上升、液滴下降和喷淋凝结等传热传质过程，实现了联机实时运行。     

公众吸入混合裂变产物后内照射剂量的简便估算方法(以ICRP 1994年呼吸道模型为依据)

作者前曾参照国际放射防护委员会第３０号出版物（ＩＣＲＰ－３０）给出了摄入混合裂变产物后内照射剂量的简便估算方法。现根据ＩＣＲＰ１９９４年人类呼吸道模型,重新给出了这一估算方法。计算出衰变速率系数ｎ＝０．２～２．０时呼吸道与消化道靶组织所受的待积当量剂量及其所致的待积有效剂量。用１９９４年呼吸道模型计算的结果低于１９７９年新肺模型的所得结果。