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±× À¯¸íÇÑ EPA (Environmental Protection Agency) ¿¡¼ °¡Àå ½Å·ÚÇÏ°í °¡Àå ¸¹ÀÌ »ç¿ëµÇ´Â ÃøÁ¤±â ŸÀÔÀÎ EIC (Electret Ion Chambers) ÀÔ´Ï´Ù. ¿ë¾î°¡ »ý¼ÒÇÏÁö¸¸, Çѱ¹¾î·Î ±¸Áö ¹ø¿ªÇÏÀÚ¸é 'ÃæÀü¸· Àü¸®ÇÔ' ¹æ½ÄÀÇ ±â°è¶ó°í ÇÒ ¼ö ÀÕ½À´Ï´Ù.
@ Shive Hattery
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EIC (Electret Ion Chambers)
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ÇöÀç ºÏ¹Ì¿¡¼ ÆǸŵǰí ÀÖ´Â Á¦Ç°µéÀÔ´Ï´Ù.
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Chamber ÀÇ ÇüÅÂÀ̱⠶§¹®ÀÔ´Ï´Ù.
¹Ù´Ú¿¡ ±ò·Á ÀÖ´Â À½ÀÌ¿ÂÀû ¶óµ· °¡½º Ä÷ºÅÍ´Â 'µð½ºÅ© (disc) ¶ó°í ºÎ¸£±âµµ ÇÕ´Ï´Ù.
Shot-Term E-Perm Radon Test Kit ¨Ï LEX Scientific Inc.
https://lexscientific.com/ecommerce/Short-Term-Radon-Test-Kit.htm
RTCA's EIC $50.00
https://rtca.com/product/long-term-electrets/
¾Æ·¡´Â WHO ÀÇ ¶óµ· ÇÚµåºÏ¿¡ ¸í½ÃµÇ¾î ÀÖ´Â EIC ÀÇ Á¤ÀÇ¿Í ¿ø¸®ÀÔ´Ï´Ù.
EICs are passive devices that function as integrating detectors for measuring the
average radon gas concentration during the measurement period. The electret serves
both as the source of an electric field and as a sensor in the ion chamber. Radon gas,
but not decay products, enters the chamber by passive diffusion through a filtered
inlet. Radiation emitted by radon and its decay products formed inside the chamber
ionizes the air within the chamber volume. The negative ions are collected by the
positive electret located at the bottom of the chamber. The discharge of the electret
over a known time interval is a measure of time-integrated ionization during the
interval. This in turn is related to the radon concentration. The electret discharge in
volts is measured using a noncontact battery-operated electret reader. This value,
in conjunction with a duration and calibration factor, yields the radon concentration
in desired units. Typical short-term EICs are designed to measure radon for 2 to 15
days at a concentration of 150 Bq/m3. The long-term EICs measure radon over 3 to
12 months at a concentration of 150 Bq/m3. EICs have been described previously
(Kotrappa et al. 1990). These devices have been used in various countries and have
displayed excellent accuracy and precision if standard operating procedures (routine
correction for background gamma radiation, assuring the electrets are free of dust,
etc.) are followed (Sun et al. 2006).
EIC ´Â ƯÁ¤ ÃøÁ¤ ±â°£ µ¿¾ÈÀÇ Æò±Õ ¶óµ· °¡½º ³óµµ¸¦ ÃøÁ¤Çϱâ À§ÇÑ ÅëÇÕ °ËÃâ±â ±â´ÉÀ» ¼öÇàÇÏ´Â ¼öµ¿Çü ÀåÄ¡ÀÔ´Ï´Ù. ÀÏ·ºÆ®¸´ Electret Àº À̿ è¹ö (¿øÅëÇü ÄÉÀ̽º) ÀÇ ¼¾¼ÀÌÀÚ ¿ÀÇ ±Ù¿ø ÀÛ¿ëÀ» ÇÕ´Ï´Ù. ¶óµ· °¡½º°¡ è¹ö ¾ÈÀ¸·Î µé¾î°¡°Ô µÈ´Ù¸é è¹ö ³»ºÎ¿¡ Çü¼ºµÈ ¶óµ· ¹× ±× ºØ±« »ý¼º¹°¿¡ ÀÇÇØ ¹æÃâµÇ´Â ¹æ»ç¼±°ú ºØ±«µÈ ¹°ÁúµéÀº è¹ö ¾ÈÀÇ °ø±â¸¦ 'ÀÌ¿ÂÈ' ÇÏ°Ô µË´Ï´Ù. ÀÌ·¸°Ô »ý¼ºµÈ À½ÀÌ¿ÂÀº, è¹öÀÇ ¹Ù´ÚÂÊ¿¡ ÀÖ´Â ¾ç±Ø ÀÏ·ºÆ®¸´¿¡ ¸ðÀÌ°Ô µÇ°í, ÀÌ ¹Ù´ÚÀÇ ÀÏ·ºÆ®¸´ÀÇ ¹æÀü ½Ã°£¿¡¿¡ µû¶ó ÀÌ¿ÂÈÀÇ °ªÀ» ÃøÁ¤ÇÏ°í, ÀÌ ½Ã°£Àº °ð ¶óµ· ³óµµ¿Í Á÷°áµÇ´Â °ÍÀÔ´Ï´Ù. ÀÏ·ºÆ®¸´ÀÇ ¹æÀüÀº ºñÁ¢ÃË½Ä ¹èÅ͸®·Î ÀÛµ¿µÇ´Â ÀÏ·ºÆ®¸´ Æǵ¶±â¸¦ »ç¿ëÇÏ¿© ÃøÁ¤ÇÏ°Ô µË´Ï´Ù. ÀÌ·¸°Ô Çؼ °è»êµÈ °è¼ö¿Í ÇÔ²² ¶óµ· ³óµµ¸¦ »êÃâÇÏ°Ô µÇ´Â °ÍÀ̸ç, ÀϹÝÀûÀ¸·Î ´Ü±â EIC ´Â ÀÌƲ¿¡¼ º¸¸§ Á¤µµ ¶óµ·À» ÃøÁ¤Çϵµ·Ï ¼³°è µÇ¾î ÀÖÀ¸¸ç, 150 Bq/m3 ÀÇ ³óµµ¸¦ ±âÁØÀ¸·Î ÃøÁ¤ÇÏ°Ô µË´Ï´Ù. ´Ù¾çÇÑ ±¹°¡¿¡¼ ÇØ´ç ÀåÄ¡°¡ »ç¿ëµÇ¾î ¿Ô°í Ç¥ÁØ È¯°æ°ú ÀÛµ¿ ÀýÂ÷¸¦ ÁؼöÇÑ °æ¿ì, ¿ì¼öÇÑ Á¤È®µµ ¹× Á¤¹Ðµµ¸¦ ³ªÅ¸³»°í ÀÖ½À´Ï´Ù.
(¹ø¿ª: (ÁÖ)¹ÙƼ¿¡)