A method for comparing the luminous efficiency of plastic scintillators

Abstract

The present invention relates to a method for comparing the luminous efficiency of plastic scintillators, belonging to the field of plastic scintillator performance evaluation. The method involves placing a liquid scintillation vial containing a plastic scintillator and a point-shaped gamma radiation source into a liquid scintillation instrument for measurement, thereby obtaining a liquid scintillation spectrum. The obtained liquid scintillation spectrum is then subjected to first-order derivative processing to find the channel value C corresponding to the lowest point of the first-order derivative. The luminous efficiency of the plastic scintillators is then compared by comparing the channel values ​​C. The method disclosed in the present invention allows for comparison of the relative luminous efficiency of plastic scintillators using a commonly available commercial liquid scintillation counter in laboratories. The method is simple, easy to operate, highly practical, and has strong advantages for widespread adoption.

Description

Technical Field

[0001] The invention belongs to the field of plastic scintillator performance evaluation, and in particular relates to a method for comparing the luminous efficiency of plastic scintillators. Background Art

[0002] Plastic scintillator is an organic scintillating material that produces fluorescence when exposed to α, β, γ, fast neutrons, and cosmic rays. Therefore, it is widely used in various radiation detectors. Plastic scintillators with high luminous efficiency help improve detector sensitivity. Therefore, it is important to compare the luminous efficiency of plastic scintillators when selecting them.

[0003] Currently, there are no commercial instruments on the market that can directly measure the luminous efficiency of plastic scintillators. It is necessary to use instruments such as photomultiplier tubes, multi-channel analyzers and high-voltage power supplies to build the experimental device by yourself, which is complicated to operate. Summary of the Invention

[0004] In view of the defects in the prior art, the present invention aims to provide a method for comparing the luminous efficiency of plastic scintillators. The method uses a common commercial liquid scintillation counter in the laboratory to compare the relative luminous efficiency of plastic scintillators. The method is simple, easy to operate and highly practical.

[0005] To achieve the above objectives, the present invention adopts a technical solution: a method for comparing the luminous efficiency of plastic scintillators, the method comprising the following steps:

[0006] S1. Place the liquid scintillation bottle containing the plastic scintillator and the point-shaped gamma radiation source into the liquid scintillation instrument for measurement to obtain a liquid scintillation spectrum;

[0007] S2. Calculate the first-order derivative of the obtained liquid scintillation spectrum and find the value C corresponding to the lowest point of the first-order derivative;

[0008] S3. Compare the luminous efficiency of the plastic scintillator by comparing the value C.

[0009] Furthermore, in step S1 , the plastic scintillator is placed in a liquid scintillation bottle and its geometric position is fixed.

[0010] Furthermore, a holder is installed at the bottom of the liquid scintillation bottle, and the plastic scintillator is installed in the holder.

[0011] Furthermore, the center of the holder is a square groove, and the plastic scintillator is polished into a cube so as to be installed in the holder groove.

[0012] Furthermore, in step S1, a point-shaped gamma radiation source is fixed at the center of the bottom of the liquid scintillation bottle.

[0013] Furthermore, a gamma radiation source is attached to the center of the bottom of the liquid scintillation bottle.

[0014] Furthermore, in step S2, the larger the value of C is, the stronger the luminous efficiency of the plastic scintillator is.

[0015] Furthermore, in step S1, the gamma radiation source includes Cs-137, Eu-152 and Ba-133.

[0016] Furthermore, the size and shape of the groove in the center of the holder match the size and shape of the plastic scintillator, so that the plastic scintillator can be installed in the holder groove.

[0017] The beneficial technical effects of the present invention are as follows: using the disclosed method for comparing the luminous efficiency of plastic scintillators, a liquid scintillation vial containing a plastic scintillator and a point-shaped gamma radiation source is placed in a liquid scintillation instrument for measurement to obtain a liquid scintillation spectrum; performing first-order derivative processing on the obtained liquid scintillation spectrum to find the channel value C corresponding to the lowest point of the first-order derivative; and comparing the channel value C to compare the luminous efficiency of the plastic scintillators. Using the disclosed method for comparing the luminous efficiency of plastic scintillators, the relative luminous efficiency of plastic scintillators can be compared using a commonly available commercial liquid scintillation counter in laboratories. The method is simple, easy to operate, highly practical, and has strong advantages for widespread application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A device for measuring plastic scintillators used in a method for comparing the luminous efficiency of plastic scintillators according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of a first-order derivative of a liquid scintillation spectrum in a method for comparing the luminous efficiency of plastic scintillators according to an embodiment of the present invention;

[0020] In the figure: 1-liquid scintillation bottle, 2-plastic scintillator, 3-γ radiation source, 4-card holder. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] An embodiment of the present invention provides a method for comparing the luminous efficiency of plastic scintillators, the method comprising the following steps:

[0024] S1. Place the liquid scintillation bottle 1 fixed with the plastic scintillator 2 and the point-shaped gamma radiation source 3 into the liquid scintillation instrument for measurement to obtain a liquid scintillation spectrum.

[0025] The plastic scintillator 2 is placed in the liquid scintillator bottle 1 and its geometric position is fixed. A point-shaped gamma radiation source 3 is fixed at the center of the bottom of the liquid scintillator bottle 1. The gamma radiation source 3 can be Cs-137, Eu-152, or Ba-133.

[0026] like Figure 1 As shown, a holder 4 is installed at the bottom of the liquid scintillation bottle 1 , and the size and shape of the groove in the center of the holder 4 match the size and shape of the plastic scintillator 2 so that the plastic scintillator 2 can be installed in the groove of the holder 4 .

[0027] In this embodiment, the center of the card holder 4 is a 1 cm square groove. The plastic scintillator 2 is polished into a cube with a side length of 1 cm and installed in the card holder 4. In fact, the shape and size of the center groove of the card holder 4 and the plastic scintillator are not limited.

[0028] In this embodiment, a gamma radiation source 3 is adhered to the center of the bottom of the liquid scintillation bottle 1 .

[0029] The assembled device was placed into a liquid scintillation instrument for measurement to obtain a liquid scintillation spectrum.

[0030] S2. Take the first-order derivative of the liquid scintillation spectrum and find the value C corresponding to the lowest point of the first-order derivative. Take the first-order derivative of the spectrum, such as Figure 2 As shown, the value corresponding to the minimum value of the first-order derivative is taken as the value C.

[0031] S3. The luminous efficiency of the plastic scintillator can be compared by comparing the size of the C value. The larger the C value, the stronger the luminous efficiency of the plastic scintillator.

[0032] In the embodiment of the present invention, three plastic scintillators were compared, and the measurement results are shown in Table 1. From Table 1, it can be seen that the channel value C of plastic scintillator 2 is the highest, and thus it can be seen that plastic scintillator 2 has the highest scintillation efficiency.

[0033] Table 1 C value of various scintillation fluids

[0034] serial number C Plastic scintillator 1 632 Plastic scintillator 2 677 Plastic scintillator 3 640

[0035] As can be seen from the above embodiments, the method disclosed in the present invention for comparing the luminous efficiency of plastic scintillators addresses the drawback of existing methods for measuring the relative luminous efficiency of plastic scintillators, which suffer from complex operation. The method involves placing a liquid scintillation vial containing a plastic scintillator and a point-shaped gamma radiation source into a liquid scintillation instrument for measurement, obtaining a liquid scintillation spectrum. The obtained liquid scintillation spectrum is then subjected to first-order derivative processing to find the channel value C corresponding to the lowest point of the first-order derivative. The luminous efficiency of the plastic scintillators is then compared by comparing the channel values ​​C. The method disclosed in the present invention for comparing the luminous efficiency of plastic scintillators can be used to compare the relative luminous efficiency of plastic scintillators using a commonly available commercial liquid scintillation counter in laboratories. The method is simple, easy to operate, highly practical, and has strong advantages for widespread adoption.

[0036] The method described in the present invention is not limited to the embodiments described in the specific implementation manner. Those skilled in the art may derive other implementation manners based on the technical solution of the present invention, which also fall within the scope of the technical innovation of the present invention.

Claims

1. A method for comparing the luminous efficiency of plastic scintillators, the method comprising the following steps: S1. Place the liquid scintillation bottle containing the plastic scintillator and the point-shaped gamma radiation source into the liquid scintillation instrument for measurement to obtain a liquid scintillation spectrum; S2. Calculate the first-order derivative of the obtained liquid scintillation spectrum and find the value C corresponding to the lowest point of the first-order derivative; S3. Comparing the luminous efficiency of the plastic scintillator by comparing the values ​​of the channel C; In step S1, the plastic scintillator is placed in a liquid scintillation bottle and its geometric position is fixed; A holder is installed at the bottom of the liquid scintillation bottle, and the plastic scintillator is installed in the holder; the size and shape of the groove in the center of the holder match the size and shape of the plastic scintillator, so that the plastic scintillator is installed in the holder groove.

2. The method for comparing the luminous efficiency of plastic scintillators according to claim 1, wherein: The center of the card seat is a square groove, and the plastic scintillator is polished into a cube so as to be installed in the card seat groove.

3. The method for comparing the luminous efficiency of plastic scintillators according to claim 1, wherein: In step S1, a point-shaped gamma radiation source is fixed at the center of the bottom of the liquid scintillation bottle.

4. The method for comparing the luminous efficiency of plastic scintillators according to claim 3, wherein: Attach a gamma radiation source to the center of the bottom of the liquid scintillation bottle.

5. The method for comparing the luminous efficiency of plastic scintillators according to claim 1, wherein: In step S2, the larger the value of C is, the stronger the luminous efficiency of the plastic scintillator is.

6. The method for comparing the luminous efficiency of plastic scintillators according to claim 1, wherein: In step S1, the gamma radiation sources include Cs-137, Eu-152 and Ba-133.

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