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金昌均,許俊 高麗大學校 倂設 保健大學 保健科學硏究所 1979 保健科學論集 Vol.10 No.1
In X-ray diagnosis, the scattered rays exert an evil influence upon X-ray film quality control and X-ray film finding. Therefore, many users of X-ray are not sparing of these labor to get rid of the scattered ray originated from the objects. These scattered rays were primarily influenced by the thickness of objects and the applied tube voltage. Authors made a study on the scattered ray dose to be influenced by the tube voltage and the object, and we obtained the results as follows; 1. Every objects play an important role as the scatterer in thin objects, but the other hand they function as the absorber in thick objects under a fixed tube voltage. 2. Every objects have the maximum build up points of the scattered ray under a fixed tube voltage. 3. The scattered X-ray were more influenced by the tube voltage than the thickness of object.
放射線遮蔽物質에서 附加濾過가 散亂線發生에 미치는 影響의 硏究
金昌均,許俊 高麗大學校 倂設 保健大學 保健科學硏究所 1980 保健科學論集 Vol.11 No.1
Exposure of scattered x-rays, at 135' and a distance of 1 m from the central ray of the primary beam, was measured at the back of all radiation shielding materials. Cement brick. Fire brick-red color, Fire brick-black color and Lead plate, for a 30×30㎝ field size. Scattered x-rays were measured from 125 to 200 kvp for 0-2mm Cu+1㎜Al added filter in the primary beam for an x-ray deep therapeutic unit, and obtained the results as follows: 1. The ability to absorb the radiation of the shielding materials were greatly depended on the used added filter. 2. The quantity of produced scattered x-rays had an influence upon the used added filter. 3. The rate of the scattered ray increase was carried away by the tube voltage and the used added filter.
金昌均 高麗大學校 倂設 保健大學 保健科學硏究所 1992 保健科學論集 Vol.18 No.1
This study was carried out to investigate the radiation exposure dose to patient(adults) in head P-A projection, bas on e 66 hospitals located in Seoul. As a result, the following conclusions have been reached : 1. 68.18% of the surveyed hospitals made use of 70∼79 kVp(M±SD : 72.62±5.48 p) as tube voltage. 2. As tube current, 81.82% of the surveyed hospitals had the use o± 40∼69 mAs(M±SB : 50.7±14.9 mAs) . 3. Shallow equivalent doses ranged from 2.00 mSv to 3.99 mSv and the mean was 3.02 mSv.
金昌均,李海龍,許俊 高麗大學校 倂設 保健大學 保健科學硏究所 1976 保健科學論集 Vol.7 No.1
Authors surveyed 68 units of diagnostic x-ray apparatus in Seoul area. The main purpose of this survey was to find out the protection problems in x-ray apparatus, especially, in the aspect of leakage ray from x-ray tube housing. As the result of this survey, the following conclusions were obtained. 1. In beam alignments, small capacity x-ray equipment (less than 60mA) were in generally used cone and large capacity machines in use were collimator. 2. Cones were too big in size and the materials were lack in thickness for its standard. Therefore, the function and role of the cone was not adequate. 3. Added filters used in beam were thin material for their tube voltage. 4. Leakage ray from x-ray tube housing in majority of domestic produce apparatus exceeds, the dose limit.
김창균,최종학,김성환,최원의,최승환 高麗大學校 倂設 保健大學 保健科學硏究所 2000 保健科學論集 Vol.26 No.1
The results for a dose calibrator to measure the quantity of radionuclide are as follows; 1. Preciseness ; the value satisfied a permitted limit(±5%). 2. Accuracy ; the value was in the range of the permitted limit that is demanded from the manufacture. It might be because of the radiation that used corrected source of low dose. 3. Reliability ; Though the values for 2 months were in the range of ±5%, 2 days' values were beyond the range of -5%.