[Instrument Introduction]

SURRCRadiation food and drug detectorSystem PSL(also known as irradiation food screening system) is a portable laboratory instrument used for rapid detection or screening of whether food or its components have been exposed to radiationirradiationThe detectable range includes herbs, spices and seasonings, fruits and vegetables (including dehydrated vegetables), as well as products with shells or bone fragments such as crustaceans and meat. It is currently the standard method for detecting irradiated food in the European Union（EN13751-2002）The recommended testing instrument in China (note: the EU standard EN13751 has been accepted by the Codex Alimentarius Commission as a world standard for detecting irradiated food), and is also the main instrument used by many European, American, and Japanese countries to detect the radiation level of imported food (that is, to determine whether it has been irradiated by measuring the PSL signal intensity of the food).

SURRCRadiation food and drug detectorSystem PSLIt consists of a pulse excitation light source, a sample chamber, a detection probe, a photon counting system (UK Patent No. 2291707), and a control unit. The operation is very simple, and it can be used in the laboratory or carried for on-site measurement. By using supporting software, it can also be combined with computers for data collection and processing.

The photon counting technology greatly improves the sensitivity of detection, making direct detection of samples possible without the need for tedious and time-consuming preprocessing. SURRC PPSLThe system is particularly suitable for detecting herbs, spices, and seasonings, can also be used for detectionFruits and Vegetables, as well as products such as crustaceans and meat containing shells or bone fragments. In fact, the system is also applicable in a wider range of food products.

When measuring, simply place the sample in a covered culture dish and then transfer it to the sample chamber. The sample can be directly measured without preparation. The non-contact measurement process makes it very convenient to detect different types of food without worrying about cross contamination. Screening and testing only take 15 seconds; The test results will be indicated by corresponding indicator lights. For irradiated herbal and spice samples, the one-time correct detection rate is over 95%.

SURRC System PSLThere are two operating modes to choose from:

Screening mode - Based on the set threshold and time parameters, simply press the testing button lightly after placing the sample into the sample chamber, and the result will be given in 15 seconds. The screening mode does not require a computer connection. Very suitable for routine rapid testing of regular samples.

Connected to a computer for use - When connected to a computer for use, software can be used to customize measurement parameters (such as measurement time, threshold standards, and data recording conditions, etc.), obtain specific photon counts of the sample, measure dark counts (photon counting rate in the sample chamber without light stimulation), empty cell counts (counting rate in the Wu sample chamber to determine whether the sample chamber is contaminated), and perform sensitivity tests on photomultiplier tubes, etc. And it can perform calibration PSL measurement on samples with uncertain screening results, etc.

SURRC systemPSLCompared to othersPSL irradiation food detectorCompared to other methods, the PSL method has many outstanding advantages:

1. Samples do not require pre-treatment - the vast majority of samples can be measured by placing them in a culture dish after sampling. The thermoluminescence (TL) method requires complex pre-treatment of the sample, which usually takes several days. Therefore, the period for measuring a sample usually exceeds one week.

2. Easy to operate - it only takes 15-60 seconds to get the result after pressing the button.

3. High accuracy - Taking irradiated herbs and spices as an example, the accuracy of a single detection is over 95%.

4. Widely applicable - the vast majority of foods can be tested, making it the most widely applicable method among all irradiated food testing methods.

5. Clean and environmentally friendly - no need for any chemical reagents. However, methods such as thermoluminescence (TL) require the use of many toxic and harmful chemical reagents.

6. Cost saving - Due to the lack of sample pre-treatment, daily testing costs are very low.

7. Easy to carry - convenient for on-site measurement or sharing between different laboratories.

[About PSL method]

PhotoStimulated Luminescence (PSL) is a standard method for detecting irradiated food, based on the principle that mineral residues, especially silicates or inorganic calcium, are very common in food. When exposed to ionizing radiation (irradiation), these minerals accumulate energy in charge carriers. When stimulated by excitation light, these stored energies will be released in the form of photons, forming an excitation spectrum. The PSL method does not damage the sample, so mixtures of organic and inorganic substances can be repeatedly measured. However, repeated measurements of the same sample can weaken the PSL signal. For screening detection, the signal level generated will be compared with two defined thresholds. Samples with signal strength above a higher threshold indicate exposure to radiation; Samples with signal strength below a lower threshold indicate that they have not been irradiated; The intermediate signal strength between two thresholds suggests that further testing or investigation should be conducted on the sample. The dual threshold concept provides an extremely effective screening method, with a one-time correct detection rate of over 95%.

Note: Due to the high cost of the instrument, for the convenience of customers with insufficient funds or small sample sizes, our company also undertakes sample testing. You can send us your sample and our laboratory will provide you with an experimental report after testing. Customers with this requirement are welcome to contact us.