JP4768646B2 - Radiation detection method - Google Patents

Description

In the thermoluminescence method (hereinafter referred to as “TL method”) for detecting whether or not a food material is irradiated with radiation for sterilization or modification, the present invention adheres to the food material. have a radiation irradiation Iken known method used to irradiating the mineral.

  It is known to irradiate radiation for sterilizing or modifying food ingredients. When it is necessary for food manufacturers to check whether or not the obtained raw material has been irradiated, conventionally, a part of the food raw material has been sent to a specialized institution or the like to request an investigation. A specialized institution or the like collects fine mineral substances adhering to the food ingredients that have been sent, and determines whether or not this is a product that has been subjected to radiation irradiation by the TL method.

  The TL method consists of several steps. In the first step, the collected mineral is heated and the radiation energy accumulated in the mineral is thermally emitted, the emission curve is measured, and the integrated value of the emission peak temperature and the emission amount in the temperature rising range is measured. (Glow-1 measurement). In the next second step, the mineral is re-irradiated with a predetermined amount of radiation (typically 1 kGy radiation), and in the next third step, the mineral is reheated to re-heat the mineral. The radiation energy accumulated in the sample is thermally emitted, the emission curve is measured, and the integrated value of the emission peak temperature and the emission amount in the temperature rising range is obtained (Glow-2 measurement). The final fourth step is determination. This determination is based on the data of Glow-1 measurement and Glow-2 measurement, and (1) there is a peak of the emission curve in the range of 150 to 250 ° C., and (2) the TL ratio (the amount of light emission at Glow-1 When (integral value ÷ integral value of light emission amount at Glow−2) is greater than 0.1, for example, it is determined that the food material is irradiated with radiation.

  Food manufacturers manage food raw materials for each lot, send a part of food raw materials of each lot to specialized institutions, etc., and conduct Glow-1 measurement, radiation re-irradiation, and Glow-2 measurements to specialized institutions I was asking. As another aspect, when a radiation manufacturer is not provided, for example, when a food manufacturer or a determination trader performs detection by the TL method, after collecting Glow-1 measurement data from collected minerals, radiation irradiation is performed. It is a food material that has been irradiated by collecting Glow-2 measurement data for minerals after radiation re-irradiation sent to specialized institutions equipped with facilities to perform and returned from specialized institutions It was necessary to determine whether or not.

The object of the present invention is to apply a TL method to minerals collected from food materials and detect whether the food material is a product that has been subjected to radiation irradiation. It is to provide a convenient radiation irradiation Iken intellectual way for specialized agencies such as irradiation with.

A further object of the present invention is that a person away from a radiation irradiation engine or the like sends a mineral after Glow-1 measurement to the radiation irradiation engine or the like, and performs a Glow-2 measurement of the mineral received from the radiation irradiation engine or the like. Another object of the present invention is to provide a radiation irradiation detection method that makes it easy to transport minerals to and from a radiation irradiation engine.

The above-mentioned technical problem, according to the onset Akira,
A thermoluminescence measuring device that measures the amount of luminescence by heating the mineral substance to determine whether the food ingredient is a product irradiated with radiation through the mineral substance collected from the food ingredient. Radiation irradiation is carried out by transporting the mineral matter between the determination location and the radiation re-irradiation location, where the installed determination location and the radiation re-irradiation location for irradiating the mineral with radiation are geographically separated. It is a radiation irradiation detection method for determining whether or not it is a food material that has been implemented,
A sample dish with a surrounding wall;
A carrier comprising flat upper and lower surfaces parallel to each other and a plurality of holes opened on at least one of the upper and lower surfaces, each hole having a height substantially the same as the height of the sample pan And a carrier having a shape complementary to the peripheral wall of the sample dish, and capable of accommodating the sample dish in each hole;
In order to cover the hole of the carrier, when the hole opens only on the upper surface of the carrier, it is installed on the upper surface of the carrier, and when the hole opens on the upper surface and lower surface of the carrier, Hard plates installed on the top and bottom surfaces;
A fixing member for fixing the plate to the carrier;
In the determination place, the mineral substance collected from the food raw material is put in the sample pan, and the light emission amount of the mineral substance is measured at the determination place, Glow-1 step,
In the determination place, the second step of fixing the plate to the carrier by the fixing means after covering the sample dish containing the mineral after completion of the Glow-1 step in the hole of the carrier and covering with the plate. When,
A third step of transporting the carrier containing the sample dish and covered with the plate from the determination location to the radiation re-irradiation location;
A fourth step of irradiating with radiation while leaving the sample dish in the carrier at the radiation re-irradiation place;
In the radiation re-irradiation place, after the fourth step is finished, from the radiation re-irradiation place to the determination place, a fifth step of transporting the carrier containing the sample dish and covered with the plate;
In the determination place, remove the plate and take out the sample dish from the hole of the carrier, Glow-2 step of measuring the amount of light emission of the mineral,
In the determination place, the measurement result obtained in the Glow-1 process and the measurement result obtained in the Glow-2 process are compared to determine whether or not the food material is an irradiated item. This is achieved by providing a radiation irradiation detection method having six steps .

  That is, according to the present invention, between the determination place where the thermoluminescence measuring device is installed and the radiation re-irradiation place equipped with the facility for irradiating radiation, the sample (collected from the food raw material) is used. By transporting (mineral substances), it is possible to irradiate the minerals in the radiation irradiating equipment while irradiating the radiation at the radiation re-irradiation site, and determine the radiation. In place, the TL method can be carried out smoothly.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a flow chart for a food maker or a determination trader who receives a delivery to determine whether the delivered food material (for example, spices or dried vegetables) is a product irradiated with radiation. is there. A food manufacturer or a judgment company A has a thermoluminescence measuring device (TL measuring device) 1 shown in FIG. 2 in the company, and the TL measuring device 1 is used to measure Glow-1 and Glow-2. From the measurement data, it is determined whether or not the food material to be inspected is a product irradiated with radiation.

  The TL measuring device 1 in FIG. 2 is a conventionally known device, and the sample dish 2 containing the mineral collected from the food raw material to be inspected is heated by the heater 3 so that the radiation accumulated in the mineral is collected. Energy is emitted by heat and the amount of light emitted is measured.

  After the food manufacturer or the determination trader A performs the Glow-1 measurement using the TL measuring device 1, the radiation irradiation instrument 10 (FIGS. 3 and 4) is kept while the mineral substance is put in the sample pan 2 used for the measurement. ) To a specialized institution equipped with a facility for irradiating radiation, and the specialized institution irradiates the radiation as it is with the radiation irradiating device 10, and then sends the radiation irradiating apparatus 10 to the food manufacturer or the judgment supplier A Return (Figure 1).

  The radiation irradiation instrument 10 will be described with reference to FIGS. 3 and 4. Referring to FIG. 3 that is an exploded perspective view, the radiation irradiating device 10 includes a carrier 11 having a rectangular shape in plan view, and a flat hard plate 13 that covers the carrier 11. The carrier 11 is composed of an aluminum or stainless steel block having a width of 55 mm, a length of 50 mm, and a thickness of 10 mm. A total of 12 holes 12 are arranged in three rows and four rows on one flat surface. It is formed with. The total twelve holes 12 are circular holes having the same diameter, and the sample dish 2 is accommodated in the holes 12. The sample dish 2 is made of aluminum and has a peripheral wall 2a that is circular in plan view and a flat circular bottom 2b. It is preferable that the diameter of the hole 12 is slightly larger than the diameter of the sample dish 2 in order to remove the sample dish 2 from the hole 12 using tweezers. Further, the height dimension of the hole 12 is preferably substantially the same as the height dimension of the peripheral wall 2 a of the sample dish 2.

  As can be seen from the above description, since the hole 12 of the carrier 11 is used to accommodate the sample dish 2, for example, if the shape of the sample dish 2 is a polygon in plan view, the shape of the sample dish 2 It should be made in a complementary shape.

  The hard plate 13 included in the radiation irradiating device 10 is made of a material that can transmit radiation, such as plastic (for example, polystyrene, polyethylene terephthalate, polycarbonate, polyvinyl chloride) or glass. After the sample pan 2 containing the mineral to be measured is accommodated in the hole 12 of the carrier 11, the plate 13 is placed on the carrier 11 as shown in FIG. The hard plate 13 is fixed to the carrier 11 using the rubber ring 14. Instead of the rubber ring 14, a metal clip or an easily peelable adhesive tape may be used. In a state in which the hard plate 13 is fixed, even if the posture of the carrier 11 is changed, for example, even if it is turned upside down, the state in which the sample dish 2 is accommodated in the hole 12 of the carrier 11 can be maintained. It is possible to prevent the mineral substance from overflowing from the sample dish 2. That is, the hard plate 13 has a function of a lid of the sample tray 2 accommodated in each hole 12 of the carrier 11.

  The hard plate 13 is preferably transparent. By adopting the transparent plate 13, the presence or absence of the sample dish 2 can be visually confirmed from the outside while the plate 13 is fixed to the carrier 11. Can do.

  As a specific example, about 1 mg of the mineral substance separated and purified for each lot from the black pepper received at the food manufacturer or judgment company A is precisely weighed and placed in each sample dish 2, and the mineral substance in each sample dish 2 is measured with a TL measuring device. 1 measured Glow-1. Next, each sample dish 2 is accommodated in the hole 12 of the carrier 11, covered with a hard plate 13, and the radiation irradiation instrument 10 in a state where the hard plate 13 is fixed to the carrier 11 with a rubber ring 14, for example, I sent it to a specialized institution of radiation irradiation using a courier. A specialized institution or the like places the radiation irradiation device 10 in which the hard plate 13 is fixed to the carrier 11 with the rubber ring 14 on the belt conveyor of the radiation irradiation apparatus and irradiates a predetermined amount of radiation, and this work is finished. After that, the instrument 10 for radiation irradiation was returned to the food maker or the judgment supplier A as it was.

  The returned food manufacturer or judgment company A removes the rubber ring 14 and removes the plate 13, and then removes the sample dish 2 from the hole 12 of the carrier 11 using tweezers, and removes the mineral substances in each sample dish 2. Glow-2 was measured with the TL measuring device 1. FIG. 5 shows measurement data of the amount of luminescence of Glow-1 and Glow-2. Glow-1 (irradiation) means data on minerals collected from the food material subjected to radiation irradiation. Unirradiated means mineral data collected from food ingredients that have not been irradiated.

  The determination as to whether or not the irradiation was carried out was as follows: (1) A peak was observed in the range of 150 to 250 ° C. in Glow-1, and (2) the food material that was irradiated when the TL ratio> 0.1. It is determined that Here, the TL ratio is defined by (integrated value of Glow-1 emission amount) / (integrated value of Glow-2 emission amount).

  In order to identify the sample pan 2 accommodated in a part of the twelve holes 12 of the carrier 11 or in the front hole 12, the numbers or letters 1 to 3 and A to D as shown in FIG. By writing magic in the rows and columns of the twelve holes 12 on the surface, writing them on the carrier 11 with paint, or engraving them on the carrier 11, the correspondence between the sample dish 2 and the holes 12 in which it is placed, for example, A1 = By leaving a note such as the first lot, A2 = second lot, it is possible to clarify the relationship between the mineral substance placed in the sample dish 2 and the lot of the food material collected from this. .

  As described above, by using the radiation irradiation instrument 10 of the embodiment, it is not only convenient for irradiating minerals collected from food raw materials to detect the presence or absence of radiation irradiation by the TL method. Moreover, it is convenient for the conveyance between the food manufacturer or judgment company A and the specialized organization.

  Although the carrier 11 described above includes a total of 12 holes 12, the number of the holes 12 is arbitrary and may be one hole 12. Moreover, you may comprise the hole 12 of a row or a column with the continuous long hole 15 as shown in FIG. 6, FIG. Moreover, although each hole 12 and 15 of the carrier 11 illustrated in FIG. 3, FIG. 4, FIG. 6, and FIG. 7 is bottomed, as shown in FIG. A pair of upper and lower hard plates 17 and 18 may be covered.

  Regarding the plates 13, 17 and / or 18 made of the hard material described above, as a variant, it may be made of a soft material with cushioning properties. By making the plates 13, 17 and / or 18 from a material having cushioning properties, even if the depth of the hole 12 of the carrier 11 is slightly larger or smaller than the height of the peripheral wall 2 a of the sample dish 2, the cushion is used. It is possible to prevent the contents (mineral substances) from overflowing from the sample dish 2 by the soft plate having the property. Of course, when the hole 12 of the carrier 11 is covered with the hard plate 13, 17 and / or 18, a cushioning material is formed on the portion of the plate 13, 17 and / or 18 corresponding to the hole 12. May be laminated.

Flow chart of each process for judging the presence or absence of carrying out of mineral matter between food manufacturers etc. and specialized institutions etc. that irradiate radiation using the radiation irradiating device of the embodiment and the implementation of radiation irradiation by the TL method It is. It is a figure for demonstrating the outline | summary of a TL measuring apparatus. It is a disassembled perspective view of the instrument for radiation irradiation of the Example of 1st Example. It is a perspective view of the instrument for radiation irradiation of the state which accommodated several sample dishes. It is a figure for demonstrating the determination method of the presence or absence of implementation of the radiation irradiation by TL method. It is a top view for demonstrating the modification of the instrument for radiation irradiation. It is sectional drawing along the VII-VII line of FIG. It is sectional drawing for demonstrating the further modification of the instrument for radiation irradiation.

Explanation of symbols

1 Thermoluminescence measuring device (TL measuring device)
2 Sample pan 2a Peripheral wall of sample pan 2b Circular bottom of sample pan 10 Radiation irradiation instrument 11 Carrier 12 Carrier hole 13 (17, 18) Plate 14 Rubber ring

Claims (6)

Through the mineral collected from food material, whether the article which the food material is irradiated in order to determine the TL method, thermoluminescence measuring device for measuring the light emission quantity by heating the mineral material Radiation irradiation is carried out by transporting the mineral matter between the determination location and the radiation re-irradiation location, where the installed determination location and the radiation re-irradiation location for irradiating the mineral with radiation are geographically separated. It is a radiation irradiation detection method for determining whether or not it is a food material that has been implemented,
A sample dish with a surrounding wall;
A carrier comprising flat upper and lower surfaces parallel to each other and a plurality of holes opened on at least one of the upper and lower surfaces, each hole having a height substantially the same as the height of the sample pan And a carrier having a shape complementary to the peripheral wall of the sample dish, and capable of accommodating the sample dish in each hole;
In order to cover the hole of the carrier, when the hole opens only on the upper surface of the carrier, it is installed on the upper surface of the carrier, and when the hole opens on the upper surface and lower surface of the carrier, Hard plates installed on the top and bottom surfaces;
A fixing member for fixing the plate to the carrier;
In the determination place, put the mineral collected from the food material in the sample pan, and Glow-1 measuring the light emission amount of the mineral in the judgment place,
In the determination place, a second step of fixing said plate to said carrier by said fixing means covered by said plate after said sample dishes in mineral said Glow-1 process is finished accommodated in the hole of the carrier When,
A third step of transporting the carrier containing the sample dish and covered with the plate from the determination location to the radiation re-irradiation location;
A fourth step of irradiating with radiation while leaving the sample dish in the carrier at the radiation re-irradiation place;
In the radiation re-irradiation place, after the fourth step is finished, from the radiation re-irradiation place to the determination place, a fifth step of transporting the carrier containing the sample dish and covered with the plate ;
In the determination place, remove the sample pan from the hole of the carrier by removing the front Symbol plate, and Glow-2 measuring the light emission amount of the mineral,
In the determination place, the measurement result obtained in the Glow-1 process and the measurement result obtained in the Glow-2 process are compared to determine whether or not the food material is an irradiated item. A radiation irradiation detection method comprising 6 steps. The radiation irradiation detection method according to claim 1, wherein the hole for accommodating the sample dish is a bottomed hole opened on an upper surface of the carrier. The radiation irradiation detection method according to claim 1, wherein the hole for accommodating the sample dish is configured by a through hole opened on an upper surface and a lower surface of the carrier. The radiation irradiation detection method as described in any one of Claims 1-3 with which the character and / or code | symbol which can specify a sample pan are provided in the surface of the said carrier. The radiation irradiation detection method according to claim 1, wherein the plate is transparent. The radiation irradiation according to any one of claims 1 to 5, wherein when the hole of the carrier is covered with the plate, at least a portion of the plate that covers the hole is made of a cushioning material. Detection method.

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