The capacity to generate iaterleukin-2(IL-2)of,and autologous rosette forming cel-ls(ARFC)ratio of 46 cancer patients(29 nasopharygeal carcinoma,11 lymphoma and6 leukemia)were studied.A several important things have been found as follows:(1)There was a significant decrease in capacity of cancer patient peripheral blood mono-nuclear cells(PBMC)to generate IL-2 after being stimulated for 48 hr by PHA(18%,whencompared to controls;P0.05);(3)The cancer patient plasma could markedly inhibit IL-2 generation,but control plasmadid not.This result suggested that the patient plasma contain immunosuppressive fact-or(s)which can block IL-2 generation;(4)ARFC ratio in cancerpatients was greatlylower than that of controls(10% and 22% respectively;P

Objective Based on the anthropomorphic phantom experiment and Monte Carlo simulation, the patients’ skin dose, professionals’ dose, and spatial distribution of DSA (Digital Subtraction Angiography) radiation field in an intervention procedure, was performed, in order to provide the basis for the inference of patients’ skin injury and professionals’ radiation protection in intervention procedure. Methods In the simulation experiment, a PBU-60 anthropomorphic phantom was used as the patient and the skin dose of patient’s abdomen was measured by TLD (Thermoluminescence Dosimeters). X-ray and gamma radiation dosimeter (AT1121) was applied to measure the spatial distribution of DSA radiation field, which was verified using Monte Carlo software MCNP meanwhile. Furthermore, the radiation dosimetry of operative staffs at different stations and under different protection conditions was studied experimentally. Results The experimental measurements showed that the maximum skin dose of patients every 5-minute fluoroscopy was 18.62 mGy under the irradiation of PA in an abdominal interventional procedure. The results of Monte Carlo simulation and measurement experiments showed that the spatial distribution of DSA radiation fieldis similar to the butterfly distribution, which is related to distance and angle. The experimental results showed that the dose rate decreases exponentially with the increase of lead equivalent. Conclusion It is very significant to carry out skin dose measurementof patients during interventional surgery and follow-up patients with high dose after surgery. In interventional surgery, doctors should try to avoid the station of high dose rate. However, it is necessary to strengthen the radiation protection of the operator and the first assistant. Under the dual protections of bedside lead protective equipment and personal protective equipment, the exposure dose of intervention personnel can be significantly reduced.