A rare-earth element-doped pyrophosphate long afterglow material that can only be excited by X-rays, its preparation method and application

Abstract

This invention belongs to the field of long afterglow materials, and discloses a rare earth element-doped pyrophosphate long afterglow material that can only be excited by X-rays, its preparation method, and its applications. The general chemical formula is M. 2‑ x P2O7:xR, where M is at least one of Sr and Ba, and R is at least one of Dy, Tm, Pr, and Sm; where x is the molar content of R, and 0 < x ≤ 0.1. This long-afterglow material is a long-afterglow material that can only be excited by X-rays. After being excited by X-rays, it emits bright green, purple, reddish-brown, and orange-red light visible to the naked eye, making it easy to observe. At the same time, it cannot be excited by white light or ultraviolet light, and the influence of natural light can be ignored in daily use. The afterglow duration of this material after being excited by X-rays can reach at least 4000 seconds. After being irradiated by X-rays for a period of time, it can still be re-excited with hot water to make it emit light. Due to its unique optical properties, the long-afterglow material prepared by this invention can be used for portable X-ray detection in daily home use.

Description

Technical Field

[0001] This invention belongs to the field of long afterglow materials, specifically relating to a rare earth element-doped pyrophosphate long afterglow material that can only be excited by X-rays, its preparation method, and its application. Background Technology

[0002] Long persistence is a unique delayed photoluminescence phenomenon where the afterglow continues for a considerable period after excitation ceases. Compared to fluorescence, which relies on real-time excitation, long persistence luminescence can last for seconds, hours, or even days. In imaging, persistence imaging achieves high signal-to-noise ratio imaging by simply acquiring persistence photons, completely eliminating background interference from autofluorescence. In detection, it can also serve as a delayed detection method.

[0003] In recent years, due to the high penetrating power of X-rays into biological tissues, X-ray-excited long-persistence imaging has attracted increasing attention. Representative examples include rare-earth-doped NaYF4 (Light Sci Appl 2018) and Pr... 3+ Ion-doped Cs₂NaYF₆ (Nat. Nanotechnol 2021), etc., can cause certain hazards if not properly protected or used in applications (such as individual injury or increased cancer incidence in the population). Existing standard X-ray dosimeters are expensive and generally used for environmental monitoring; traditional X-ray detection boxes require periodic dose testing at designated disease control centers and are generally used by radiology, dentistry, and other personnel working in radiation environments for extended periods; Invention patent CN200510086189.1 reports a photofluorescence radiation dose detection technology, which stores the radiation dose using a photofluorescent dosimeter, excites it with a light source in a photoelectric system, and reads the stored radiation dose using a sensitive weak light detection device, but the technical process is relatively complex. Given the current problems of high cost, technical complexity, and inconvenience in use, new X-ray dosimetry technologies urgently need to be developed.

[0004] Rare earth ions (Pr 3+ 、Sm 3+ Er 3+ Dy 3+ Tm 3+ (e.g., ) are often used as sensitizers in the development of long afterglow materials. For example, commercial long afterglow materials such as Eu... 2+ and Dy 3+ Co-doped Sr₂Al₂O₄ can emit green light at 520 nm under 365 nm ultraviolet light excitation, and this emission lasts for 30 hours (J. Lumin 1997); Pr 3+Doped calcium titanate can produce a red afterglow lasting up to 12 hours under 365 nm ultraviolet light excitation (Chem.Eng.J2022); Sm 3+ Doped Na2CaSn2Ge3O 12 It can produce an orange-red afterglow under 254nm ultraviolet light excitation, lasting for at least 4.8 hours (Inorg.Chem2013); Tm 3+ Doped Ca₂SnO₄ can be excited by 254 nm ultraviolet light to produce a blue-green afterglow for nearly 5 hours (Spectrochim. Acta, Part A 2015). Rare earth element-doped long-afterglow materials are diverse and can be excited by various methods to produce long afterglows of various colors. However, rare earth element-doped pyrophosphate long-afterglow materials that can only be excited by X-rays have not yet been reported. Summary of the Invention

[0005] To address the shortcomings and deficiencies of existing technologies, the primary objective of this invention is to provide a rare-earth element-doped pyrophosphate long-afterglow material. This material can only be excited by X-rays to produce bright green, purple, reddish-brown, and orange-red light visible to the naked eye, and cannot be excited by white light or ultraviolet light, thus remaining unaffected by natural light in daily life. Furthermore, after being irradiated by X-rays for a period of time, it can still be re-excited with hot water to emit bright green light, making it suitable for everyday personal and household X-ray dosing detection. The unique feature of this invention is the first synthesis of a novel rare-earth element-doped pyrophosphate long-afterglow material, which can only be excited by X-rays to produce a bright, long-afterglow visible to the naked eye.

[0006] Another objective of this invention is to provide a method for preparing the above-mentioned rare earth element-doped pyrophosphate long afterglow material.

[0007] Another object of the present invention is to provide the application of the above-mentioned rare earth element-doped pyrophosphate long afterglow material.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] A rare earth element-doped pyrophosphate long afterglow material with the general chemical formula M 2-x P2O7:xR, where M is at least one of Sr and Ba, and R is at least one of Dy, Tm, Pr, and Sm;

[0010] Where x is the molar content of R, and 0 < x ≤ 0.1.

[0011] Preferably, 0.01 ≤ x ≤ 0.08.

[0012] Preferably, x = 0.02, x = 0.04, or x = 0.08.

[0013] Preferably, the rare earth element-doped pyrophosphate long afterglow material is Sr. 1.98 P2O7: 0.02Dy, Sr 1.96 P2O7: 0.04Dy, Sr 1.92 P2O7: 0.08Dy, Ba 1.98 P2O7: 0.02Dy, Sr 1.98 P2O7: 0.02Tm, Sr 1.98 P2O7: 0.02Pr, Sr 1.98 P2O7:0.02Sm.

[0014] Preferably, the rare earth element-doped pyrophosphate long afterglow material can only be excited by X-rays to emit a long afterglow, and the afterglow duration can reach at least 4000 seconds.

[0015] A method for preparing a rare earth element-doped pyrophosphate long afterglow material includes the following steps:

[0016] Weigh the raw materials according to the molar ratio, mix them evenly, pre-calcine at 800-900℃ for 0.5-3 hours, cool, grind and mix, and calcine at 950-1100℃ for 4-7 hours to obtain rare earth element doped pyrophosphate long afterglow material.

[0017] Preferably, the raw materials for elements M and R are at least one of oxides, hydroxides, carbonates, oxalates, acetates, and nitrates of elements M and R. More specifically, the raw materials for element M are at least one of oxides, hydroxides, carbonates, oxalates, acetates, and nitrates of element M, and the raw materials for element R are at least one of oxides, oxalates, acetates, and nitrates of element R.

[0018] The phosphorus element in the raw materials is at least one of dihydrogen phosphate, hydrogen phosphate, or orthophosphate.

[0019] Preferably, the raw material containing Sr is at least one of strontium carbonate, strontium oxalate, strontium acetate, and strontium hydroxide;

[0020] The raw materials containing Ba are at least one of barium carbonate, barium oxalate, barium acetate, and barium hydroxide;

[0021] The raw material containing phosphorus is at least one of diammonium hydrogen phosphate, ammonium dihydrogen phosphate, and ammonium hydrogen phosphate;

[0022] The raw materials containing Dy element are at least one of dysprosium oxide, dysprosium nitrate, dysprosium acetate, and dysprosium oxalate;

[0023] The raw materials containing Tm are at least one of thulium oxide, thulium nitrate, thulium acetate, and thulium oxalate;

[0024] The raw materials containing Pr are at least one of praseodymium oxide, praseodymium nitrate, praseodymium acetate, and praseodymium oxalate;

[0025] The raw materials containing Sm are at least one of samarium oxide, samarium nitrate, samarium acetate, and samarium oxalate.

[0026] Applications of the above-mentioned rare earth element-doped pyrophosphate long afterglow materials in bioluminescent imaging materials or devices.

[0027] Application of the above-mentioned rare earth element-doped pyrophosphate long afterglow materials in X-ray dosimetry.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] This invention provides a rare-earth element-doped pyrophosphate long afterglow material that can only be excited by X-rays. Specifically, Dy 3+ The doped material emits bright green light visible to the naked eye when excited by X-rays, easily observed in the wavelength range of 555 nm, where the human eye is most sensitive. Its afterglow characteristic peaks are located at 480 nm and 575 nm. Furthermore, it cannot be excited by white light or ultraviolet light, therefore the influence of natural light can be ignored in everyday use. The synthesized Sr... 1.98 P2O7:0.02Dy can have an afterglow duration of at least 4000 seconds after being excited by X-rays, and can still be re-excited with hot water to emit a bright green light after being irradiated by X-rays for a period of time.

[0030] At the same time, Pr 3+ When the doped material is excited by X-rays, it produces a bright reddish-brown long afterglow visible to the naked eye. The characteristic afterglow peaks are located at 489 nm and 606 nm, and the afterglow duration can reach at least 4000 seconds.

[0031] Tm 3+ When the doped material is excited by X-rays, it produces a bright purple long afterglow visible to the naked eye. The characteristic afterglow peaks are located at 361nm, 454nm, 657nm, 751nm, and 792nm, and the afterglow duration can reach at least 4000 seconds.

[0032] Sm 3+ When the doped material is excited by X-rays, it produces a bright orange-red long afterglow visible to the naked eye. The characteristic peak of the afterglow is located in the range of 550 nm to 720 nm, and the afterglow lasts for at least 4000 seconds.

[0033] In terms of applications, compared with existing X-ray dosimetry tools, the personal portable X-ray detection tool made using the novel long-afterglow material proposed in this invention is lower in cost, simpler in technology, easier to observe, and more convenient to use. Attached Figure Description

[0034] Figure 1Sr prepared in Example 1 1.98 XRD pattern of P2O7:0.02Dy.

[0035] Figure 2 Sr prepared in Example 1 1.98 Fluorescence excitation / emission spectrum of P2O7:0.02Dy.

[0036] Figure 3 Comparison of afterglow spectra of samples prepared in Example 1, Example 2, Example 3 and Comparative Example 1 after being excited by X-rays.

[0037] Figure 4 Sr prepared for Examples 1, 4, and 2 1.98 Comparison of afterglow spectra of P2O7:0.02Dy after being excited by X-rays.

[0038] Figure 5 Sr prepared in Examples 1 and 5 1.98 Comparison of afterglow spectra of P2O7:0.02Dy after being excited by X-rays.

[0039] Figure 6 Sr prepared for Examples 1, 6, 3, and 4 1.98 P2O7: 0.02Dy, Ba 1.98 P2O7: 0.02Dy, Ca 1.98 P2O7: 0.02Dy and Mg 1.98 Comparison of afterglow spectra of P2O7:0.02Dy after being excited by X-rays.

[0040] Figure 7 Sr prepared in Examples 1, 7, 8, 9 and Comparative Example 5 1.98 P2O7: 0.02Dy, Sr 1.98 P2O7: 0.02Pr, Sr 1.98 P2O7: 0.02Tm, Sr 1.98 P2O7: 0.02Sm and Sr 1.98 Instantaneous display of P2O7:0.02Er after being excited by X-rays.

[0041] Figure 8 The image shows the afterglow decay curve of Example 1 after being excited by X-rays.

[0042] Figure 9 Sr prepared in Example 1 1.98 Thermoluminescence spectra of P2O7:0.02Dy after being excited by X-rays, white light flashlights, and ultraviolet light flashlights, respectively.

[0043] Figure 10Sr prepared in Example 1 1.98 The instantaneous image of P2O7:0.02Dy doped into a silica gel sheet and excited by X-rays.

[0044] Figure 11 Sr prepared in Example 1 1.98 The image shows a P2O7:0.02Dy doped silica gel sheet that was excited by X-rays and then attached to the wall of a hot water cup after a period of time.

[0045] Figure 12 Sr prepared in Examples 7-9 1.98 P2O7: 0.02Pr, Sr 1.98 P2O7: 0.02Tm and Sr 1.98 Afterglow spectrum of P2O7:0.02Sm after being excited by X-rays. Detailed Implementation

[0046] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings. However, the implementation of the present invention is not limited thereto. For process parameters not specifically noted, conventional techniques can be referred to.

[0047] Example 1

[0048] Sr 1.98 Preparation and related characterization properties of P2O7:0.02Dy

[0049] According to the molar ratio of Sr:P:Dy = 1.98:2:0.02, weigh 0.0495 mol of strontium carbonate (SrCO3), 0.05 mol of diammonium hydrogen phosphate (NH4)2HPO4, and 0.00025 mol of dysprosium oxide (Dy2O3), place them in a quartz mortar, add an appropriate amount of anhydrous ethanol (just enough to wet the powder), and grind thoroughly. Dry in an oven at 60℃, collect in an alumina crucible, and place in a muffle furnace. The heating rate is 5℃ / min below 800℃ and 2℃ / min above 800℃ (the same applies below), and calcine at 900℃ for 1 hour. After the internal temperature of the muffle furnace cools to room temperature, remove the crucible and grind the powder again thoroughly. Collect the second-ground powder again in an alumina crucible and calcine in a muffle furnace at 1100℃ for 5 hours. After the muffle furnace cooled to room temperature, the annealed sample was removed and ground to obtain a composition of Sr. 1.98 The sample contains P2O7:0.02Dy.

[0050] Figure 1 This indicates that the synthesized Sr 1.98 P2O7:0.02Dy has a strontium pyrophosphate crystal structure, and the incorporation of Dy does not affect the crystal structure of strontium pyrophosphate.

[0051] Figure 2This indicates that the synthesized Sr 1.98 The fluorescence emission peaks of P2O7:0.02Dy are mainly located at 480 nm and 575 nm, corresponding to the fluorescence emission peaks of Dy. 4 F 9 / 2 → 6 H 15 / 2 and 4 F 9 / 2 → 6 H 13 / 2 Feature transition.

[0052] Figure 3 This indicates that the synthesized Sr 1.98 After P2O7:0.02Dy is excited by X-rays, the characteristic emission peaks of its afterglow spectrum are located at 480 nm and 575 nm, corresponding to the emission peaks of Dy. 4 F 9 / 2 → 6 H 15 / 2 and 4 F 9 / 2 → 6 H 13 / 2 Feature transition.

[0053] Figure 7 This indicates that the synthesized Sr 1.98 When P2O7:0.02Dy is excited by X-rays, it produces a bright green long afterglow that is visible to the naked eye and can be photographed with a mobile phone.

[0054] Figure 8 This indicates that the synthesized Sr 1.98 The afterglow of P2O7:0.02Dy after being excited by X-rays can last for at least 4000 seconds, which is a long afterglow duration.

[0055] Figure 9 This indicates that the synthesized Sr 1.98 P2O7:0.02Dy produces two traps, one deep and one shallow, upon X-ray excitation, but fails to produce traps upon irradiation with a white light flashlight and an ultraviolet flashlight, thus proving that the synthesized Sr... 1.98 P2O7:0.02Dy can only be excited by X-rays and cannot be excited by white light or ultraviolet light. The influence of natural light on this material during daily use is negligible.

[0056] Figure 10 , Figure 11 This indicates that using synthesized Sr 1.98 P2O7:0.02Dy is used to make silicone sheets of various shapes. When excited by X-rays, it can emit bright green light visible to the naked eye. After being excited for a period of time, it can be excited again with hot water to emit bright green light, and the color change process can be clearly observed.

[0057] Example 2

[0058] Sr 1.92 Preparation and related characterization properties of P2O7:0.08Dy

[0059] The molar ratio in Example 1 was replaced with 1.92:2:0.08, and Sr was synthesized using the same raw materials and methods. 1.92 P2O7:0.08Dy.

[0060] Figure 3 This indicates that Sr 1.92 When P2O7:0.08Dy is excited by X-rays, it can also produce a long green afterglow with emission peaks at 480nm and 575nm, and it also has a high afterglow intensity.

[0061] Example 3

[0062] Sr 1.96 Preparation and related characterization properties of P2O7:0.04Dy

[0063] The molar ratio in Example 1 was replaced with 1.96:2:0.04, and Sr was synthesized using the same raw materials and methods. 1.96 P2O7:0.04Dy.

[0064] Figure 3 This indicates that Sr 1.96 When P2O7:0.04Dy is excited by X-rays, it can also produce a long green afterglow with emission peaks at 480nm and 575nm, and it also has a high afterglow intensity.

[0065] Example 4

[0066] Sr 1.98 Preparation and related characterization properties of P2O7:0.02Dy

[0067] The second calcination temperature in Example 1 was replaced with 1000°C, and Sr was synthesized with the same molar ratio and raw materials. 1.98 P2O7:0.02Dy.

[0068] Figure 4 This indicates that the Sr synthesized at a second calcination temperature of 1000℃ 1.98 When P2O7:0.02Dy is excited by X-rays, it produces a bright green long afterglow visible to the naked eye, with emission peaks at 480nm and 575nm, and also has a high afterglow intensity.

[0069] Example 5

[0070] Sr 1.98 Preparation and related characterization properties of P2O7:0.02Dy

[0071] In Example 1, strontium carbonate (SrCO3) was replaced with strontium hydroxide (Sr(OH)2), and Sr was synthesized using the same molar ratio and method. 1.98 P2O7:0.02Dy.

[0072] Figure 5 This indicates that Sr synthesized using strontium hydroxide Sr(OH)2 1.98 When P2O7:0.02Dy is excited by X-rays, it produces a bright green long afterglow visible to the naked eye, with emission peaks at 480nm and 575nm, and also has a high afterglow intensity.

[0073] Example 6

[0074] Ba 1.98 Preparation and related characterization properties of P2O7:0.02Dy

[0075] In Example 1, strontium carbonate (SrCO3) was replaced with barium carbonate (BaCO3), and Ba was synthesized using the same molar ratio and method. 1.98 P2O7:0.02Dy.

[0076] Figure 6 This indicates that Ba 1.98 When P2O7:0.02Dy is excited by X-rays, it produces a bright green long afterglow visible to the naked eye, with emission peaks at 480nm and 575nm, and also has a high afterglow intensity.

[0077] Example 7

[0078] Sr 1.98 Preparation and related characterization properties of P2O7:0.02Pr

[0079] In Example 1, dysprosium oxide (Dy₂O₃) was replaced with praseodymium oxide (Pr₆O₃). 11 Sr was synthesized using the same molar ratio and method. 1.98 P2O7:0.02Pr.

[0080] Figure 7 This indicates that the synthesized Sr 1.98 When P2O7:0.02Pr is excited by X-rays, it produces a bright reddish-brown long afterglow that is visible to the naked eye and can be photographed with a mobile phone.

[0081] Figure 12 This indicates that the synthesized Sr 1.98 When P2O7:0.02Pr is excited by X-rays, its emission peaks are located at 489 nm and 606 nm, corresponding to the Pr... 3 P1→ 3 H4 and 1 D2→ 3 H4 feature transition.

[0082] Example 8

[0083] Sr 1.98 Preparation and related characterization properties of P2O7:0.02Tm

[0084] In Example 1, dysprosium oxide (Dy₂O₃) was replaced with thulium nitrate (Tm(NO₃)₃), and Sr was synthesized using the same molar ratio and method. 1.98 P2O7:0.02Tm.

[0085] Figure 7 This indicates that the synthesized Sr 1.98 When P2O7:0.02Tm is excited by X-rays, it produces a bright purple long afterglow that is visible to the naked eye and can be photographed with a mobile phone.

[0086] Figure 12 This indicates that the synthesized Sr 1.98 When P2O7:0.02Tm is excited by X-rays, its emission peaks are located at 361 nm, 454 nm, 657 nm, 751 nm, and 792 nm, corresponding to Tm. 1 D2→ 3 H6 1 D2→ 3 F4 1 G4→ 3 H4 3 F3→ 3 H6 3 F4→ 3 H6 feature transition.

[0087] Example 9

[0088] Sr 1.98 Preparation and related characterization properties of P2O7:0.02Sm

[0089] In Example 1, dysprosium oxide (Dy₂O₃) was replaced with samarium oxide (Sm₂O₃), and Sr was synthesized using the same molar ratio and method. 1.98 P2O7:0.02Sm.

[0090] Figure 7 This indicates that the synthesized Sr 1.98 When P2O7:0.02Sm is excited by X-rays, it produces a bright orange-red long afterglow that is visible to the naked eye and can be photographed by a mobile phone.

[0091] Figure 12 This indicates that the synthesized Sr 1.98 When P2O7:0.02Sm is excited by X-rays, its emission peak is located in the range of 550 nm to 720 nm, corresponding to the Sm... 4 G 5 / 2 → 6 H J(J = 5 / 2, 7 / 2, 9 / 2) characteristic transitions.

[0092] Comparative Example 1

[0093] Sr 1.995 Preparation and related characterization properties of P2O7:0.005Dy

[0094] The molar ratio in Example 1 was replaced with 1.995:2:0.005, and Sr was synthesized using the same raw materials and methods. 1.995 P2O7:0.005Dy.

[0095] Figure 3 This indicates that Sr 1.995 When P2O7:0.005Dy is excited by X-rays, it can also produce a long green afterglow with emission peaks at 480nm and 575nm. However, the afterglow intensity is extremely weak, which is not conducive to subsequent applications.

[0096] Comparative Example 2

[0097] Sr 1.98 Preparation and related characterization properties of P2O7:0.02Dy

[0098] The second calcination temperature in Example 1 was replaced with 1200°C, and Sr was synthesized with the same molar ratio and raw materials. 1.98 P2O7:0.02Dy.

[0099] Figure 4 This indicates that the Sr synthesized at a second calcination temperature of 1200℃ 1.98 When P2O7:0.02Dy is excited by X-rays, it produces a long green afterglow with emission peaks at 480 nm and 575 nm. However, the afterglow intensity is extremely weak, which is not conducive to subsequent applications.

[0100] Comparative Example 3

[0101] Ca 1.98 Preparation and related characterization properties of P2O7:0.02Dy

[0102] In Example 1, strontium carbonate (SrCO3) was replaced with calcium carbonate (CaCO3), and Ca was synthesized using the same molar ratio and method. 1.98 P2O7:0.02Dy.

[0103] Figure 6 This indicates that Ca 1.98 When P2O7:0.02Dy is excited by X-rays, it cannot produce a long green afterglow or any characteristic emission peak.

[0104] Comparative Example 4

[0105] Mg 1.98Preparation and related characterization properties of P2O7:0.02Dy

[0106] In Example 1, strontium carbonate (SrCO3) was replaced with magnesium hydroxide (Mg(OH)2), and Mg was synthesized using the same molar ratio and method. 1.98 P2O7:0.02Dy.

[0107] Figure 6 This indicates that Mg 1.98 When P2O7:0.02Dy is excited by X-rays, it cannot produce a long green afterglow or any characteristic emission peak.

[0108] Comparative Example 5

[0109] Sr 1.98 Preparation and related characterization properties of P2O7:0.02Er

[0110] In Example 1, dysprosium oxide (Dy₂O₃) was replaced with erbium oxide (Er₂O₃), and Sr was synthesized using the same molar ratio and method. 1.98 P2O7:0.02Er.

[0111] Figure 7 This indicates that the synthesized Sr 1.98 When P2O7:0.02Er is excited by X-rays, it cannot produce a bright, colored, long afterglow visible to the naked eye.

[0112] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. The application of a rare earth element-doped pyrophosphate long afterglow material in X-ray dosimetry, characterized in that, The general chemical formula for long afterglow materials is M 2-x P2O7 : xR, where M is at least one of Sr and Ba, and R is at least one of Dy, Tm and Sm; Where x is the molar content of R, and 0 < x ≤ 0.

1.

2. The application of a rare earth element-doped pyrophosphate long afterglow material according to claim 1 in X-ray dosimetry, characterized in that, 0.01≤x≤ 0.08。 3. The application of a rare earth element-doped pyrophosphate long afterglow material according to claim 1 in X-ray dosimetry, characterized in that, x = 0.02 or x = 0.04 or x = 0.

08.

4. The application of a rare earth element-doped pyrophosphate long afterglow material according to claim 1 in X-ray dosimetry, characterized in that, The long afterglow material of rare earth element-doped pyrophosphate is Sr. 1.98 P2O7: 0.02Dy, Sr 1.96 P2O7: 0.04Dy, Sr 1.92 P2O7: 0.08Dy, Ba 1.98 P2O7: 0.02Dy, Sr 1.98 P2O7: 0.02Tm, Sr 1.98 P2O7 : 0.02Sm.

5. The application of a rare earth element-doped pyrophosphate long afterglow material according to claim 1 in X-ray dosimetry, characterized in that, The rare earth element-doped pyrophosphate long afterglow material can only emit long afterglow when excited by X-rays.

6. The application according to any one of claims 1 to 5, characterized in that, The preparation method of the rare earth element-doped pyrophosphate long afterglow material includes the following steps: Weigh the raw materials according to the molar ratio, mix them evenly, pre-calcine at 800~900℃ for 0.5~3 hours, cool and grind and mix, calcine at 950~1100℃ for 4~7 hours to obtain rare earth element doped pyrophosphate long afterglow material.

7. The application according to claim 6, characterized in that, The raw materials for elements M and R are at least one of oxides, hydroxides, carbonates, oxalates, acetates, and nitrates of elements M and R, and the raw materials for element P are at least one of dihydrogen phosphate, hydrogen phosphate, and orthophosphate.

8. The application according to claim 6, characterized in that, Among the raw materials, the raw material containing Sr element is at least one of strontium carbonate, strontium oxalate, strontium acetate, and strontium hydroxide; The raw materials containing Ba are at least one of barium carbonate, barium oxalate, barium acetate, and barium hydroxide; The raw material containing phosphorus is at least one of diammonium hydrogen phosphate, ammonium dihydrogen phosphate, and ammonium hydrogen phosphate; The raw materials containing Dy element are at least one of dysprosium oxide, dysprosium nitrate, dysprosium acetate, and dysprosium oxalate; The raw materials containing Tm are at least one of thulium oxide, thulium nitrate, thulium acetate, and thulium oxalate; The raw materials containing Sm are at least one of samarium oxide, samarium nitrate, samarium acetate, and samarium oxalate.

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