Radiation food and drug detector/radiation residue (photoluminescence method)

BPCL-PSL15Radiation food and drug detector/radiation residue detector (photoluminescence method)

1. Background of irradiated food and drugs

Irradiation of food and drugs, also known as "ionizing radiation sterilization", refers to exposing food and drugs to free radiation. This process can eliminate microorganisms, bacteria, viruses, or tiny insects from food. Other applications include inhibiting germination, delaying fruit ripening, promoting juice production, and enhancing rehydration. This sterilization principle uses the energy of electromagnetic radiation to destroy the DNA structure in organisms, making it impossible for microorganisms to continue reproducing, and also causing plant embryos to stop growing and differentiating.

2. Radiation residue background

Vegetables, fruits, or traditional Chinese medicine often contain or carry minerals (inorganic substances, silicates, etc.), which store energy through their structural voids when exposed to ionizing radiation (irradiation). When stimulated by excitation light, these stored energies will be released in the form of photons. The photoluminescence identification method is a method of identifying whether fruits, vegetables, traditional Chinese medicine decoction pieces, and solid Chinese medicine preparations have been subjected to ionizing radiation (irradiation) based on the number of photons released.

3. Reference standards

1. European (EN) 13751:2009 standard light stimulated luminescence method

2. Guiding Principles for Photoluminescent Identification of Irradiated Traditional Chinese Medicine (Public Draft)

3. GB23748-2016 Identification standard for irradiated food

4. Analysis object

The BPCL-PSL15 irradiation food and drug detector is used to detect or screen whether food or Chinese medicinal materials and their components have been irradiated. The detectable range includes Chinese herbs, spices, seasonings, fruits and vegetables (including dehydrated vegetables), as well as products such as crustaceans and meat with shells or bone fragments.

5. Analysis principle

The BPCL-PSL15 irradiation food and drug detector uses infrared pulse excitation light source to stimulate luminescence, and determines whether the sample has been irradiated by stimulating the release of energy stored in the mineral carried in the sample during the irradiation process.

6. Analysis and Measurement

1. Photon acquisition frequency: 1.0 times/second (standard requirement), other frequencies can be customized.

2. Collection time: 60 seconds

3. Sample tray (dish): diameter 50 mm, made of stainless steel, sample quantity approximately 2g

4. PSL value: automatically calculated by software integration

5. PSL spectrum: PSL photon attenuation curve or cumulative curve on the software main interface

6. PSL dark count: When there is no light stimulation, the photon count value in the test sample chamber is less than 50

7. Blank sample tray (dish) counting: The PSL value of the test sample tray (dish) is less than 700

8. Negative reference material count: Weigh about 2g of unirradiated chili powder reference material and test for PSL value less than 700

9. Positive reference material count: Weigh about 2g of irradiated chili powder reference material and test for PSL value greater than 5000

   

7. Main features of the instrument:

1. Standard configuration includes 3 high-power LED infrared light sources with microsecond level high-frequency pulses. The three light sources radiate the sample inward at 120 ° to ensure uniform pulse irradiation in each area.

2. Drawer style sample room design with induction door, coordinated with programmable light source and electric shutter to protect the detector.

3. Pulse frequency: customizable pulse frequency

4. High sensitivity photomultiplier tube as detector, equipped with photon amplifier, low dark current, calibrated by C14 standard light source.

5. Analysis and measurement: The software main control interface selects to display the PSL photon attenuation curve or cumulative curve, and can customize the negative and positive reference thresholds and evaluate the results. It displays a real-time list of PSL values per second, calculates the average and deviation of parallel samples, and exports EXCEL/TXT grid raw data, spectra, and test reports

6. Permission and Tracking: It has the functions of account allocation and permission management, as well as audit tracking, which can achieve behavior retrieval and file retrieval. Equipped with a database, it has data anti deletion and anti tampering functions

8. Relevant technical specifications

8.1PSLPhoton detection system

(1) Detector: photomultiplier tube, photon pulse measurement.

(3) Long term stability of the instrument: RSD ≤ 1%, tested using C14 standard light source.

(4) The wavelength range is 300-650 nm

(5) PSL value collection range: 0-2.5 million CPS

(6) Photon acquisition frequency: 1.0 times/second (standard requirement), other frequencies can be customized.

(7) Collection time: 60 seconds

(8) PSL value: automatically calculated by software integration

(9) PSL spectrum: PSL photon attenuation curve or cumulative curve on the software main interface

(10) Negative reference material count: Weigh about 2g of unirradiated chili powder reference material and test for PSL value less than 700

(11) Positive reference material count: Weigh about 2g of irradiated chili powder reference material and test for PSL value greater than 5000

8.2 Light source

(1) High power light source: Standard configuration includes 3 high-power LED infrared light sources with microsecond level high-frequency pulses. The three light sources radiate the sample inward at 120 ° to ensure uniform pulse illumination in each area.

(2) Pulse frequency: The pulse frequency can be customized.

8.3 Sample Room

（1) Sample Room Specifications: Length, Width, and Height: 120 × 160 × 60 mm

(2) Sample tray (dish): diameter 50 mm, made of stainless steel, sample quantity approximately 2g

(3) PSL dark count: When there is no light stimulation, the photon count value in the test sample chamber is less than 50

(4) Blank sample tray (dish) counting: The PSL value of the test sample tray (dish) is less than 700

(5) The drawer door of the sample room is equipped with an automatic sensor. If the drawer door is not in the predetermined position, the light window shutter cannot be opened to prevent damage to the photomultiplier tube due to misoperation.

(6) The light window shutter of the detector is an automatic shutter. When the detection starts, the light window shutter is automatically opened. When the detection ends, the light window shutter is automatically closed, which can ensure that the detector opens the sample chamber door without closing it and prevent high-power LED lights from damaging the photomultiplier tube.

8.4 Measurement software

(1) Communication method: USB, maximum communication rate of 480Mbit/s, plug and play.

(2) Analysis and measurement: The software main control interface selects to display the PSL photon attenuation curve or cumulative curve, and can customize the negative and positive reference thresholds and evaluate the results. It displays a real-time list of PSL values per second, calculates the average and deviation of parallel samples, and exports EXCEL/TXT grid raw data, spectra, and test reports.

(3) Permission and Tracking: It has the functions of account allocation and permission management, as well as audit tracking, which can achieve behavior retrieval and file retrieval. Equipped with a database, it has data anti deletion and anti tampering functions.