°úÇбâÀÚÀçÀü½Ã½Ç | °ßÀûÀÇ·Ú | ¹ÌµîÀç»óÇ°»ó´ã | ¼öÃâÀÔ ¹× Á¦Á¶»ó´ã | ½ÇÇè»ó´ã | Çù·Â¾÷ü¹®ÀÇ
¹æ»ç¼± Á¶»ç ½ÄÇ° °Ë»ç±â (PPSL, Irradiated Food Screening System)
 

 

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            ¹æ»ç¼± Á¶»ç ½ÄÇ° °Ë»ç±â

SURRC Pulsed PSL System ( PPSL, Irradiated Food Screening System )

                                 

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.

 

 

±¤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.