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X¼± Verification Çʸ§ÀÇ ¹ÝÀÀ Ư¼º¿¡ °üÇÑ ¿¬±¸ Understanding the Response Characteristics of X-ray Verification Film

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Abstract

¸ñ Àû : º»¿¬±¸´Â »ó¿ëµÇ´Â CEA TVS Çʸ§ÀÇ °¨¼º°ú ÇöŹÀçÁúÀ» Kodak X-Omat V ÇÊ
¸§°ú ºñ±³ÇÏ¿© ÀÌÇØÇÏ´Â °ÍÀ» ¸ñÇ¥·Î ÇÑ´Ù.
´ë»ó ¹× ¹æ¹ý : ÀÌ ¸ñÇ¥¸¦ À§ÇØ ÀüÀÚ, ±¤ÀÚ, ¹× °¡½Ã±¤¼±ÀÇ º¹ÇÕ¹æ»ç¼±¿¡ ³ëÃâµÈ X ¼± ÇÊ
¸§ÀÇ Æ¯¼ºÄ¿ºê(H & D curve)¿¡ ´ëÇÑ Çؼ®Àû Ç¥Çö½ÄÀ» À¯µµÇØ ³»¾ú´Ù. ÀÌ ¼öÇÐÀû °ø½ÄÀº ¹Ý
ÀÀÀ² ¹× target-hit À̷п¡ ±Ù°ÅÇÏ¿© Àü°³µÇ¾ú´Ù. ±âÁ¸ÀÇ Ç¥Çö½Ä°ú´Â ´Ù¸£°Ô ÀÌ°ÍÀº Çʸ§ÀÇ
±¤¹Ðµµ¸¦ AgBr ÀÔÀÚÅ©±â ¹× ÇÔÀ¯·®°ú °°Àº ÇöŹÀçÁú°ú °ü·Ã½ÃŲ´Ù. ¶ÇÇÑ ±¤ÀÚ¿Í ÀüÀÚ¿¡ ´ë
ÇÑ °Í°ú »ó´ëÇÏ¿© Çʸ§ÀÇ °¡½Ã±¤¼±¿¡ ´ëÇÑ ¹ÝÀÀ¼ºÀ» Ư¡Áþ´Â Á¤·®Àû ÀÎÀÚ(¾çÀÚ)¸¦ À¯µµÇØ
³»¾ú´Ù. Áï, ¿ì¸®´Â Çʸ§ÀÇ ÇöŹÀçÁúÀ» ±×°ÍÀÇ °¨¼ºÀ» ±Ù°Å·Î ¾Ë°Ô ÇØ ÁÖ´Â ¼ö½Ä°ú ¾çÀÚ¸¦
À¯µµÇØ ³»¾ú´Ù. ÀÌ·¯ÇÑ Çؼ®ÀûÀÎ ¿¬±¸ÀÇ »ç¿ëÀ» º¸À̱â À§ÇÏ¿© CEA¿Í Kodak Verification
Çʸ§À» ÀüÀÚ, ±¤ÀÚ, ¹× °¡½Ã±¤¼±À¸·Î ÀÌ·ç¾îÁø º¹ÇÕ¹æ»ç¼±¿¡ ³ëÃâ½ÃÅ°°í ±× ½ÇÇè°á°ú¸¦ ÀûÀý
È÷ Çؼ®ÇÏ¿´´Ù.
°á °ú : ¿ì¸®´Â ¾Æ·¡¸¦ ³íÁõÇÏ¿´´Ù. (1) ÀÓ°è¹Ðµµ´Â AgBr ÇÔÀ¯·®ÀÌ Áõ°¡ÇÔ¿¡ µû¶ó Áõ°¡ÇÑ
´Ù. (2) Çʸ§ÀÌ °¡½Ã±¤¼±¿¡ ³ëÃâµÇ¾úÀ» ¶§ ¹®Åμ±·®±îÁö µµ´ÞÇÏ´Â µ¥¿¡ °É¸®´Â ½Ã°£Àº AgBr
ÀÔÀÚÅ©±â°¡ Áõ°¡ÇÔ¿¡ µû¶ó °¨¼ÒÇÑ´Ù. (3) Kodak Çʸ§ÀÌ º¸´Ù ´õ Å« ÀÔÀÚ¸¦ ÇÔÀ¯ÇÑ ¹Ý¸é
CEA Çʸ§Àº ´õ ¸¹Àº ¾çÀÇ AgBrÀ» ÇÔÀ¯ÇÏ°í ÀÖ´Ù. ÀÌ·¯ÇÑ °á°ú´Â Â÷ÈÄ¿¡ Çʸ§Á¦ÀÛÀÚ°¡ Á¦
°øÇÑ ÀÚ·á·Î µÞ¹ÞħµÇ¾ú´Ù.
°á ·Ð : º» ¿¬±¸´Â X¼± Çʸ§ÀÇ ¹ÝÀÀ¼ºÀ» ±× ÇöŹÀçÁú¿¡ °ü·ÃÇÏ¿© ÀÌÇØÇϱâ À§ÇÑ Çؼ®Àû,
½ÇÇèÀûÀÎ µµ±¸¸¦ Á¦½ÃÇÏ¿´´Ù.

Purpose : This study is intended to understand the sensitometric characteristics and
the emulsion properties of the commercially available CEA TVS film in comparison with
the Kodak X-Omat V film.
Materials and Methods : For this purpose. we have formulated an analytic expression
of the characteristic curves for x-ray film exposed to mixed radiation of electrons,
photons, and visible light. This mathematical expression was developed based on
reaction-rate and target-hit theories. Unlike previous expressions, it rebates optical
density to emulsion properties such as grain size and silver bromide content. We have
also developed a quantity which characterizes the film response to visible light relative
to that to photons and electrons. This quantity could be expressed as a function of rain
area. Thus, we have developed mathematical expressions and quantities with which the
emulsion properties of the films can be revealed based on the sensitometric
characteristics. Demonstrating the use of this analytical study. we exposed CEA and
Kodak verification films to the mixed radiation of electrons. Photons, and visible light,
and interpreted the experimental results accordingly.
Results : We have demonstrated that: (1) the saturation density increases as the silver
bromide content increases. (2) the time required to reach the threshold dose (to which
the film begins to respond) when films are exposed to visible light decreases as the
gram size increases, and (3) the CEA film contains more silver bromide, whereas the
Kodak film contains larger grams. These findings were supported by the data provided
by the manufacturers afterward.
Conclusion : This study presented an analytical and experimental basis for
understanding the response of X-ray film with respect to the emulsion properties.

Å°¿öµå

X-ray film; Grain size; Silver bromide; Optical density (OD); Characteristic (H & D) curve;

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