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SURRC Pulsed PSL System ( PPSL, Irradiated Food Screening System )
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The SURRC pulsed photo stimulated luminescence system was designed
and developed at the Scottish Universities Research and Reactor Centre,
and provides an opportunity for effective detection of irradiated foods
using a rapid instrumental method. Originally developed for rapid
screening of irradiated herbs, spices and seasonings, it has been
validated for a wider range of foodstuffs and is finding other scientific
applications in assessment of fire damaged structures, and environmental
dosimetry. The system is commercially available from SUERC. It has
been supplied to more than 80 UK, European and US laboratories, for
routine commercial quality testing, and in support of labelling
requirements.
The system can be used in a stand-alone mode, with simple push button
controls, or in conjunction with a laboratory computer for data storage
and record keeping. It is readily transported and easy to use.
Simple screening measurements are possible (PSL Screening), or the
system can be used in conjunction with a calibrated radiation source
(calPSL). Samples are put into disposable petri dishes. Closing the
sample drawer prepares the instrument for measurement, usually taking
15-60 seconds.
During the measurements the sample is stimulated with a pulsed Infra-Red
(IR) source, and UV-VIS Anti-Stokes Luminescence is measured with
exceptional sensitivity using a patented digital lock-in photon counting
method. Irradiated samples produce a specific signal which is detected
and quantified.
For screening, the signal level is compared with two thresholds defined
from reference data. The majority of irradiated samples produce a strong
signal above the high threshold level. Signals below the lower threshold
indicate that the samples have not been irradiated. Intermediate signal
levels between the two thresholds suggest that further tests or
investigations should be made. The two threshold concept provides an
extremely effective screening approach, achieving detection rates above
95% in first-pass laboratory tests. Samples can be retained for reference
purposes, or can be sent to a calibrated laboratory for confirmation. PSL
screening can also be backed by the internationally validated
thermoluminescence test.
The system will be of interest to any organisation concerned with
the detection of whether food or food ingredients have been
treated with ionising radiation.
The PSL system has recently been subjected to international blind trials.
The results confirmed published performance obtained in earlier research
1-7.
As a result of these trials 8-10, the PSL method has been accepted
as a validated method in the UK and as an EU standard.
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±¤Àڱع߱¤¹ý (Photostimulated Luminescence, PSL)
1) ½ÃÇè¹ý Àû¿ë¹üÀ§
°ÇÁ¶Çâ½Å·á(´Ü, À°µÎ±¸, ÈÄÃß, Á¤Çâ Á¦¿Ü), °íÃå°¡·ç, ¸¶´Ã, ¾çÆÄ¿¡ Àû¿ëÇÑ´Ù.
2) ºÐ¼®¿ø¸®
½ÄÇ°¿¡ È¥ÀÔµÈ À̹°ÁúÀÎ ±¤¹°ÁúÀÇ ¹ß±¤ Ư¼ºÀ» ÀÌ¿ëÇÏ´Â ¹æ¹ýÀ¸·Î¼ ±¤¹°ÁúÀº ¹æ»ç¼± Á¶»ç¿¡ ÀÇÇÏ¿© ¿¡³ÊÁö°¡ ÀúÀåµÇ°í ÀÏÁ¤¿ÂµµÀÇ Àû¿Ü¼±¿¡ ³ëÃâµÇ¸é ¿¡³ÊÁö¸¦ ¹æÃâÇϴµ¥ À̶§ ¹æÃâÇÏ´Â ºûÀÇ ¾çÀ» ÃøÁ¤ÇÏ¿© ¹æ»ç¼± Á¶»ç¿©ºÎ¸¦ ÆÇÁ¤ÇÏ´Â ¹æ¹ýÀÌ´Ù.
3) ÀåÄ¡ ¹× ±â±¸
°¡) ±¤Àڱع߱¤ºÐ¼®ÀåÄ¡(PSL system)£º°Ëüè¹ö, ±¤Àڱؿø (Stimulation source), ±¤¹°ÁúÃøÁ¤½Ã½ºÅÛÀ¸·Î ±¸¼ºµÈ´Ù.
³ª) ÆäÆ®¸®Á¢½Ã (Çöó½ºÆ½, Áö¸§ 50 mm)
´Ù) ¹«±Õ´ë
4) Ç¥ÁØ°Ëü
°¡) Á¶»ç°Ëü£º5¢¦10 kGy»çÀÌÀÇ ¼±·®À¸·Î ¹æ»ç¼± Á¶»çµÈ ÆÄÇÁ¸®Ä«ºÐ¸» 250 g
³ª) ºñÁ¶»ç°Ëü£º¹æ»ç¼± Á¶»çµÇÁö ¾ÊÀº ÆÄÇÁ¸®Ä«ºÐ¸» 250 g
5) °ËüÁ¶Á¦
°¡) ¸ðµç °ËüÁ¶Á¦´Â Â÷±¤Á¶°ÇÀ¸·Î ¹«±Õ´ë¿¡¼ ÇÑ´Ù.
³ª)°Ëü´Â ¸¶´Ã, ¾çÆÄÀÇ °æ¿ì ²®ÁúÀ» ÆäÆ®¸®Á¢½Ã¿¡ ´ãÀ» ¼ö ÀÖ´Â Å©±â·Î Àý´ÜÇÏ°í, ºÐ¸»°Ëü ¹× ±âŸ°ËüÀÇ °æ¿ì´Â °ñ°í·ç È¥ÇÕÇÏ¿© ÆäÆ®¸®Á¢½Ã¿¡ ¹Ù´ÚÀÌ º¸ÀÌÁö ¾Êµµ·Ï °í¸£°Ô ÆîÃÄ ´ã´Â´Ù. °¢ °Ëü¿¡ ´ëÇÏ¿© 2°³ÀÇ °Ëü¸¦ Á¶Á¦ÇÑ´Ù.
6) ½ÃÇèÁ¶ÀÛ
°¡) ¸ðµç ½ÃÇèÁ¶ÀÛÀº Â÷±¤Á¶°Ç¿¡¼ ÇÑ´Ù.
³ª) °Ëü°¡ ´ã±ä ÆäÆ®¸®Á¢½Ã¸¦ PSL ±â±â¿¡ ³Ö¾î 60ÃÊ µ¿¾È ¹æÃâµÇ´Â ±¤ÀÚ¸¦ ÃøÁ¤Çϸç 2°³ °Ëü¿¡ ´ëÇÑ ÃøÁ¤°ªµéÀ» ÃÖÁ¾ ÃøÁ¤°ªÀ¸·Î ÇÑ´Ù(¿¹£º400, 430). ´Ù¸¸, 2°³ÀÇ ÃøÁ¤°ª °£¿¡ 7) ÆÇÁ¤ÀÌ ´Ù¸¦ ¶§¿¡´Â 4ȸ Ãß°¡½ÃÇèÀ» ÇÏ¿© ÃÑ 6ȸ ÃøÁ¤°ª Áß °¡Àå ³ôÀº 2ȸ ÃøÁ¤°ªÀ» ÃÖÁ¾ ÃøÁ¤°ªÀ¸·Î ÇÑ´Ù.
7) ÆÇÁ¤
°¡) ÀϹÝÀûÀ¸·Î ±¤Àڱع߱¤¹ý (PSL)Àº ¹æ»ç¼±Á¶»ç ¿©ºÎ¸¦ ½ºÅ©¸®´×ÇÒ ¶§ »ç¿ëÇÏ´Â ¹æ¹ýÀ¸·Î¼ ÃøÁ¤°ªÀÌ T1(700 count/60ÃÊ) ¹Ì¸¸À̸é À½¼º°Ëü(Negative, ¹æ»ç¼±ÀÌ Á¶»çµÇÁö ¾ÊÀº °Ëü)·Î ÆÇÁ¤ÇÏ°í, T2(5,000 count/60ÃÊ) ÃÊ°úÀÌ¸é ¾ç¼º°Ëü(Positive, ¹æ»ç¼±ÀÌ Á¶»çµÈ °Ëü)·Î ÇÑ´Ù.
³ª) ÃøÁ¤°ªÀÌ T1¢¦T2ÀÇ °ªÀ» ³ªÅ¸³»¸é Áß°£°Ëü(Intermediate, ¹æ»ç¼± Á¶»ç¿©ºÎ¸¦ ÆÇ´ÜÇÒ ¼ö ¾ø´Â °Ëü)·Î ÇÑ´Ù.
´Ù) ¾ç¼º°Ëü¿Í Áß°£°Ëü´Â ÃÖÁ¾ È®ÀνÃÇèÀ¸·Î 8.2.2 ¿¹ß±¤¹ý¿¡ µû¶ó ½ÃÇèÇÏ¿© ±× °á°úÀÇ ÆÇÁ¤¿¡ µû¸¥´Ù.
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