Effects of long-term exposure to strong electromagnetic radiation environment on the peripheral complete blood cells of operators / 解放军医学杂志

Objective To observe the effects of long-term exposure to strong electromagnetic environment on the peripheral complete blood cells of the operators. Methods A total of 239 male workers engaged in strong electromagnetic radiation operation for at least 1 year were consecutively raised between April and October 2019 as the exposed group, and 203 male workers no-exposed to strong electromagnetic equipment were raised as non-exposed group. Multipoint measurements were done of electromagnetic frequency and power density in electromagnetic radiation operation area, the differences of blood routine indexes between the exposed group and non-exposed group were compared, and the variation trend of difference index with increased exposure years was analyzed. Results No significant difference existed between the two groups in age, gender, work experience and body mass index (BMI). The electromagnetic frequency band in the operation area was between 5.5-2000 MHz, the maximum power density could reach up to 14 W/m2in the shielding point, and reach up to 535.17 W/m2in the open area. Compared with the non-exposed group, the levels of mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC) and mean platelet volume (MPV) were significantly elevated (P<0.05), while the red blood cell count (RBC) and haematocrit (HCT) was markedly reduced (P<0.05) in the exposed group. With the prolongation of the exposure time, the levels of RBC and HCT were relatively stable, but MCH, MCHC and MPV showed fluctuation from higher to lower level. Conclusions Long-term exposure to strong electromagnetic environment may lead to lower levels of red blood cells in related workers. Compensation may be achieved through hemoglobin elevation at early stage, which nevertheless weakens through hemoglobin reduction during the exposure time prolonged.

Planning principles analysis of 7T MRI room / 医疗卫生装备

Objective To draw up a plan for 7T MRI room based on analyzing its features.Methods 3T and 7T MRI machines were compared from the aspects of weight,installation,transport space requirement,dynamic interference and magnetic field distribution.The data related to 7T MRI were studied to plan the room rationally.Results When compared with 3T MRI,7T MRI had the weight increased by 4 to 6 times,the volume raised by 30％,more dynamic interference and irregular magnetic field distribution.The ground bearing of 7T room was higher than 40 t,the minimum installation space was larger than 54 m2,and shielding was executed by ferro-magnetic structure internally and by radio externally.Conclusion 7T MRI poses high requirements on the room,and plans have to be made at advance.

Planning principles analysis of 7T MRI room / 医疗卫生装备

Objective To draw up a plan for 7T MRI room based on analyzing its features.Methods 3T and 7T MRI machines were compared from the aspects of weight,installation,transport space requirement,dynamic interference and magnetic field distribution.The data related to 7T MRI were studied to plan the room rationally.Results When compared with 3T MRI,7T MRI had the weight increased by 4 to 6 times,the volume raised by 30％,more dynamic interference and irregular magnetic field distribution.The ground bearing of 7T room was higher than 40 t,the minimum installation space was larger than 54 m2,and shielding was executed by ferro-magnetic structure internally and by radio externally.Conclusion 7T MRI poses high requirements on the room,and plans have to be made at advance.

Evaluación del ambiente electromagnético en salas de rehabilitación / Evaluation of the electromagnetic environment in rehabilitation wards

Se realizó un estudio del ambiente electromagnético en 2 departamentos de electroterapia del municipio Palma Soriano de Santiago de Cuba, a fin de obtener el patrón de distribución para diferentes modos de operatividad y explotación del equipamiento médico-terapéutico. Para la caracterización electromagnética de los ambientes evaluados se elaboró un protocolo de medición a partir del análisis de normas internacionales y se empleó un medidor isotrópico que mostró los resultados a través de mapas de contorno. El equipo electromédico Magnetomed, modelo 7200 fue el que más aportó, aunque el valor máximo de la inducción magnética obtenido (19,7 µT) estuvo por debajo del límite de exposición establecido y por encima del límite de exposición sugerido por el Grupo de Trabajo Bioiniciativa. Se recomienda limitar la permanencia de personas en sus proximidades mientras está en funcionamiento.

A study of the electromagnetic environment was carried out in 2 electrotherapy departments of Palma Soriano in Santiago de Cuba, in order to obtain the distribution pattern for different operability ways and exploitation of the medical-therapeutic equipment. For the electromagnetic characterization of the evaluated environments a measurement protocol was elaborated starting from the analysis of international standards and an isotropic measure was used that showed the results through contour maps. The electro-medical device Magnetomed, model 7200 was the one that contributed the most, although the maximum value of the obtained magnetic induction (19.7 µT) was below the established exhibition limit and above the exhibition limit suggested by the Bioiniciativa Work Group. It is recommended to limit the permanency of people around, while it is in operation.

Analysis of operators knowledge of eletromagnet in complex electromagnetic environ-ments:a preliminary investigation / 军事医学

Objective To provide reference for protection evaluation of soldiers working in a complex electromagnetic environment by investigating their knowledge on electromagnetic radiation (EMR) protection via means of a questionnaire . Methods Ninety-eight soldiers working in complex electromagnetic environments were selected by random sampling .Ques-tionnaires were designed ,involving the hazard of and protection against EMR .Then the results of the survey were analyzed . Results Ninety-four questionnaires were collected .Results showed that the soldiers had some knowledge of the difference between EMR and ionizing radiation , and the hazard of and protection against EMR , but professional training was needed . In addition, their knowledge of the hazard of and protection against EMR could be improved through education .Conclusion The knowledge about EMR is insufficient among soldiers and needs to be improved .

Discussion on the Defending Technologies for Military First-aid Equipments of the Army under Complex Electromagnetic Environments / 中国医学物理学杂志

Objective:To discuss the safety capability and defending technologies for military First-aid equipments of the army under complex electromagnetic environment.Methods:This paper analyzed the current status researching of the defending technologies for military First-aid medical equipments of the army,expatiated on the effect mechanism of the high power electromagnetic radiation on the medical equipment,and discussed the defending and reinforcing technologies.Results:The current military First-aid medical equipments of the army are of a sort defending capability,and it will have important significance to strengthen the study on the anti-electromagnetic interference technologies.Conclusion:The defending and reinforcing technologies discussed in this paper could enhance the subsistence capability of the military First-aid equipments under complex electromagnetic environments.

Discussion of Strengthening Subsistence Ability of Medical Equipment Under Complex Electromagnetic Environment / 医疗卫生装备

The survival ability of electro medical equipment under complex electromagnetic environment is researched and then various kinds of electromagnetic pulse threats of medical equipment are discussed.At last,the strategies on strengthening medical equipment electromagnetic protection capability are studied form the transfer ways of electromagnetic pollution.