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Gamma-ray Dose Measurements in a Human Phantom Using Thermoluminescent Dosimeter

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À¯¿µ¼ö ( Yoo Young-Soo ) 
Korea Atomic Energy Research institute

ÀÌÇö´ö ( Lee Hyun-Duk ) 
Korea Atomic Energy Research institute

Abstract

¹æ»ç¼± ¾ÈÀü°ü¸®ÀÇ È¿°úÀûÀÎ ¿¬±¸¸¦ À§ÇØ À¯»çÀÎü ¸ðÇüÀ» ¼³°è, Á¦ÀÛÇÏ¿´´Ù. ÀÌ ¸ðÇüÀÇ Ä¡¼ö´Â Çѱ¹ÀÎÀÇ Ã¼°Ý°ú ±Ù»çÇÏ°Ô ¸ÂÃß¾úÀ¸¸ç µÎ²² 2.5 §¯ÀÎ Æ÷¸®¿¡Ä¥·»ÆÇ 35¸Å·Î ±¸¼ºµÇ¾ú´Ù.
À¯»çÀÎü¸ðÇüÀÇ Ç¥¸é¿¡ Âø¿ëÇÑ ¿­Çü±¤ ¼³·®°è(Disc type TLD)·Î½á ¿ÜºÎ ¥ã-¹æ»ç¼±¿¡ ÀÇÇÑ ½ÅüƯÁ¤ºÎÀ§ÀÇ ÇÇÆø¼±·®À» ÃøÁ¤ÇÏ¿´À¸¸ç, ¾Æ¿ï·¯ ±íÀÌ¿¡ µû¸¥ Èí¼ö¼±·®¿¡ ´ëÇØ¼­ ¿­Çü±¤ ¼±·®°è(micro rod type TLD)·Î½á ÃøÁ¤ÇÏ¿© °áÁ¤Àå±â ºÎÀ§ÀÇ °¢´Ü¸é¿¡ ´ëÇÑ µî°¡¼±·®¼±À» ¾ò¾ú´Ù.
¼±·®ÃøÁ¤Àº ¹æ»ç¼± ÀÛ¾÷ÀÚÀÇ ÀÛ¾÷ȯ°æÁ¶°Ç¿¡ À¯»çÇϵµ·Ï À¯»çÀÎü ¸ðÇü¿¡ ´ëÇØ ¹èÄ¡ÇÏ°í ¿©·¯ ÀÔ»ç¹æÇâ¿¡ ´ëÇØ¼­ ½Ç½Ã ÇÏ¿´´Ù. ±× °á°ú Cs-137, ¥ã-¹æ»ç¼±¿¡ ´ëÇÏ¿© µÎ²² 20 §¯ÀÎ À¯»çÀÎü ¸ðÇü¿¡¼­ÀÇ °¨¼â´Â 0.439¿´À¸¸ç ÀÌ´Â º¸°íµÈ ÀÚ·áµé°ú Àß ÀÏÄ¡ÇÏ¿´´Ù.
A human phantom of polyethylene has been designed and sculptured for studying the effective radiation safety control. The phantom has the appro¡©ximate size of the Korean adult and was sliced into thirty-five transverse slabs, 2.5 cm thick.
The relative dose at the specified position was determined from the exposure that a TLD badge worn on the surface of the phantom body received from external 7-ray. The variation of the exposure as a function of depth in the, phantom was measured for uncollimated 7-ray using TLD rods, and also isodose curves were obtained for the anatomical cross-section of the critical organs of the body.
To simulate radiation exposure condition in the nuclear facility, measurem¡©ents were made for given angles of incident 7-ray. The front to back attenuation factor for human phantom of thickness 20 cm was 0. 439 for Cs137 7-ray which is in reasonable agreement with the published data.

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