1984年 · 第04卷第02期

A study of comparing the RBC T_1/2of rats under severe burn, irradiation and combined injury of the two above agents was carried out. It appears that the RBC destruction is not likely due to a direct damage from the primary injurious agents but to an indirect effect which is produced by the disturbed internal environment resulting from the primary agents.

This paper reports the intercomparison of the measurements of environmental exposure rate in Chengdu and Fulin with NE1597A scintillation ratemeters, FD-71 scintillation radiometers and FT-620 portable meters for X, γ-exposure rates. The results showed that the energy responses of NE1597A and FD-71 were comparatively poor, and the response of the contribution by cosmic rays was very low. These gamma spectra obtained from the surface soil in different areas and environments were different, and ehe dose responses of the background radiation in different areas and environments were varied. Hence, the correction of the different energy responses for measured results was difficult. NE1597A and FD-71 were unsuitable for use in the dose evaluation as well as in the survey of environmental γ-exposure rate of large area Contrarily, the FT-620 was a sensitive, portable instrument for measuring environmental γ-exposure rate with much better energy response, especially in large area.

This paper describes the structure and the characteristics of the TLD-313 thermoluminescent dosemeter for personnel monitoring. It has a pencil-like casing made of plexiglass. The TL phosphor (Mg₂SiO₄) is capsulated in two glass tubes measuring φ2 × 12mm and φ2 × 10mm, respectively. It has a strong glow peak at 230~250℃.

A linear dose response relationship was observed from 0.03mR to 20R. The photon energy dependence, which was improveP by a helical coil filter of Pb-Sn alloy, was + 19% in the energy range from 28keV to 1.25 MeV. The largest variation of directional dependence was less than 5% for ⁶⁰Co gamma rays and 38% for 28keV X-rays.

In a hospital at Changchun the personnel in the process of overhaul of a ⁶⁰Co therapy unit's driving device received a certain amount of radiation dose. With the aim of minimizing the risks of accidental exposure the author proposed that the regular maintenance of the driving device should be placed as an important item on the hospital's schedule. The vulnerable part must be overhauled at least every 3~4 years.