JP2011056131A - Medical drape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical drape for giving a visual alarm to an operator easily in order to avoid suffering from radiation exposure without the use of a radiation detection alarm nor a radiation detector. <P>SOLUTION: A medical drape is composed as follows. A reflective layer comprising a metal, which reflects a visible light, and a luminance layer generating the visible light by X-ray excitation having 10 eV or more of energy are laminated on a substrate sheet having radiation resistance and elasticity. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a medical drape used in surgery or the like, and more particularly to a medical drape capable of confirming the presence or absence of radiation exposure by light emission.

  In a catheter operation under fluoroscopy, an operator often approaches a radiation generation region because the operator operates the catheter while performing fluoroscopy near the patient. X-rays emitted directly from an X-ray source are not only directly visible, but are also exposed to radiation caused by secondary scattered radiation. It is difficult. For this reason, there was a possibility that an operator etc. may accidentally be exposed to radiation.

  Therefore, in order to protect the surgeon from radiation exposure, there have conventionally been proposed devices that give several warnings against radiation exposure. For example, an X-ray fluoroscopy device equipped with a radiation exposure warning device has been considered. This apparatus adds an optical indicator (visible light illumination) to the X-ray fluoroscopic apparatus so that visible light hits a place that coincides with the radiation generation region. In addition, by applying infrared rays or the like to a place that coincides with the X-ray generation area and monitoring it with a video camera or the like, an acoustic warning is given when a part of the operator's body enters the area. For the radiation exposure, the former visually alerts the surgeon, and the latter alerts auditorily (see Patent Document 1).

  Furthermore, various alarm devices for detecting radiation have been commercially available. For example, there is a portable radiation detection alarm (trade name: NukAlert) manufactured by NukAlert, USA. This device is capable of "radiation monitoring & alarm", "monitoring is ON for 24 hours and life is 10 years (with battery)", "detects in the range of 1mSV / h to 1000mSV / h, which is dangerous to human life 10 levels of alarm (1mSV / h, alarm once every 35 seconds; 2mSV / h, alarm twice every 30 seconds; 500mSV / h or more (maximum) Continue)).

JP 2001-112750 A

  However, in the technique disclosed in Patent Document 1, an optical indicator means for pseudo-visualization of an area crossed by X-rays in advance in an X-ray fluoroscopic apparatus, an optical monitoring means for monitoring intervention in a radiation area, An acoustic warning means for generating an acoustic warning signal when entering the radiation area is added. Therefore, such a warning cannot be made with an X-ray fluoroscopic apparatus not provided with these. In addition, radiation passes through the material, but visible light emitted by the optical indicator hardly transmits the object. Therefore, if there is a shielding object between the optical indicator and a part of the operator's body, it will be “hand dark”. There is a problem that a situation occurs and the warning cannot be issued correctly.

  In addition, the radiation detection alarm can detect the radiation applied to the radiation detector. However, in order to grasp the entire radiation generation region, there is no choice but to install and measure a plurality of detectors spatially. There is a problem that it is not appropriate.

  The present invention has been made to solve the above problems, and easily gives a visual warning for avoiding radiation exposure to an operator without using a new radiation detection alarm or radiation detector. It is an object to provide a medical drape that can be used.

  According to one embodiment of the present invention, on a base sheet having radiation resistance and elasticity, a reflective layer made of a metal that reflects visible light, and light emission that emits visible light by X-ray excitation having an energy of 10 eV or more. A medical drape characterized by comprising a stack of layers is provided.

  In addition, the light emitting layer is formed from at least one of a first region having a light emission luminance that is substantially proportional to the X-ray intensity to be irradiated and a second region having a substantially constant luminance regardless of the irradiation radiation intensity. A medical drape characterized by comprising is provided.

  According to the present invention, a visual warning for avoiding radiation exposure can be easily given to an operator without newly using a radiation detection alarm or a radiation detector.

  Furthermore, in the present invention, since the change of the X-ray fluoroscopy device or the like can be made unnecessary, there is an effect that warning can be made at low cost.

1 is a perspective view of a medical drape according to a first embodiment of the present invention. It is a figure which shows the cross-section of the medical drape which concerns on the 1st Embodiment of this invention. It is a figure explaining an Auger deactivation process in the quantum dot of the medical drape which concerns on embodiment of this invention. (A) is the case where the excitation light is ultraviolet light, and (b) is the case where the excitation light is X-rays. It is a graph which shows the relative visibility with respect to the wavelength prescribed | regulated by a CIE standard. It is a perspective view of the medical drape which concerns on the 2nd Embodiment of this invention. It is the figure which drawn typically the change with time of the brightness of the medical drape concerning the embodiment of the present invention. (A) shows the intensity change of excitation light, (b) shows the time change of fluorescence brightness, (c) shows the time change of phosphorescence brightness. It is a perspective view of the medical drape which concerns on the 3rd Embodiment of this invention. It is a figure which shows the cross-section of the medical drape which concerns on the 3rd Embodiment of this invention. It is a figure which shows the modification of the determination area | region shape formed in the medical drape which concerns on the 3rd Embodiment of this invention.

  Embodiments of the present invention will be described in detail with reference to the drawings. When performing an operation such as a catheter operation under fluoroscopy, the patient is mostly covered with a medical drape from a hygienic viewpoint. The present embodiment shows a medical drape that emits radiation, and can visually and simply warn the operator of the presence or absence of radiation exposure. In particular, the present embodiment applies to X-rays having energy of 10 eV or more as radiation to be used.

<First Embodiment>
FIG. 1 is a perspective view of a medical drape according to the first embodiment of the present invention, and FIG. 2 is a diagram showing a cross-sectional structure of the medical drape according to this embodiment.

  FIG. 1 shows a medical drape 11 and a radiation source (X-ray source) 12 indicated by an asterisk. When the X-ray source 12 is a point light source, the radiation spreads in a conical shape and becomes a circular exposed region 13 on the medical drape 11. Since the medical drape 11 of this embodiment is formed so as to emit light when irradiated with radiation, the radiation-exposed region 13 emits visible light. As described above, the medical drape has a function capable of determining the presence or absence of radiation exposure in addition to the function as the original medical drape. Furthermore, since the radiation intensity is proportional to the luminance of the light emitting part, the radiation intensity can be determined.

  FIG. 2 shows a cross-sectional view taken along the line AB in FIG. The medical drape 11 of the present invention includes a base material sheet 21 serving as a drape fabric, a reflective layer 22 that reflects visible light thereon, and a light emitting layer 23 that emits visible light 25 upon receiving radiation 24 thereon. Consists of

  The base material sheet 21 is required to have a radiation resistance in addition to the sanitary characteristics used for normal drape, and it is necessary to select a flexible material because it is necessary to cover the subject. For example, a thin sheet of radiation resistant rubber is suitable.

  The reflective layer 22 is necessary for reflecting light in the visible region emitted from the light emitting layer 23, and a reflective layer made of metal is provided. The reflective layer 22 should have a thickness as thin as possible as long as the reflective layer 22 can sufficiently reflect visible light due to the requirement for flexibility. The reflective layer 22 is formed from a metal foil, and can be directly formed on the base material sheet 21 by a method such as metal vapor deposition. The reflection layer 22 may be any metal material that reflects visible light. For example, aluminum is used as a relatively inexpensive metal that can be deposited and can have high reflectance.

Here, when aluminum is used as the vapor deposition metal, the thickness of the reflective layer 22 is estimated. Visible light is an electromagnetic wave having a frequency of 400 [THz] to 750 [THz], and aluminum has a conductivity σ of 40 × 10 ⁶ [S / m] and a magnetic permeability of 4π × 10 ⁻⁷ . When the penetration depth (skin depth) of electromagnetic waves is calculated considering the case of the longest wavelength of visible light, the skin depth may be only about 4.0 [nm] at 400 [THz] (red). I understand. Therefore, if it has a thickness of 40 [nm] with a margin, it can sufficiently function as a reflective layer. Since the thickness of the reflection layer 22 estimated in this way can be made very thin, it can be seen that the base sheet 21 on which the metal such as aluminum is deposited does not cause any problem in flexibility. In this embodiment, although the example which forms the reflection layer 22 by vapor deposition was shown, it can form also by other methods, such as joining metal foil and the base material sheet 21. FIG.

  Next, the light emitting layer 23 is formed on the reflective layer 22 by stacking quantum dots 26 made of a direct transition type semiconductor material that emits fluorescence in the visible light region when radiation is used as excitation light. (The enlarged view of the light emitting layer 23 is shown to Fig.2 (a)). Since the emission intensity of a single quantum dot is very small, it is only necessary to stack to a level at which the luminance of visible light 25 can be visually confirmed. The quantum dots 26 are mixed with the filling material 27 and applied. Moreover, the groove | channel 28 for hold | maintaining flexibility is formed as needed.

  A quantum dot is a nanoparticle made of an inorganic compound having a particle diameter of several nanometers to several tens of nanometers. When the excitation light has the same wavelength, the composition ratio of the compound material to be formed is changed even in the quantum dots. Thus, the wavelength of fluorescence can be controlled. Furthermore, since the quantum dot has a three-dimensional well-type potential structure in which electrons are confined three-dimensionally, by changing the particle diameter of the quantum dot in the wavelength region where the compound material used has a light emission gain, There is a remarkable feature that the wavelength of the emitted fluorescence itself can be controlled by changing the band gap structure.

  As quantum dots using semiconductor materials, those using CdSe, CdTe, etc. have been put into practical use as soon as possible. However, since cadmium (Cd) is a specific harmful substance, it is not preferable to use it as a medical drape.

Therefore, materials that do not use Cd are required for medical drapes. For example, there is a semiconductor nanoparticle having a composition of (AgIn) _X Zn _(1-2X) S (silver, indium, zinc, sulfur) developed by a group of Osaka University, Nagoya University, and IDEC. These semiconductor nanoparticles are prepared by a photoetching method, and when irradiated with ultraviolet light having a wavelength of 350 [nm], the particle diameter is controlled within a range of 2 to 3 [nm], thereby enabling the change from 12 to 12 from green to red. It has succeeded in emitting fluorescence at the stage.

  The quantum efficiency of this quantum dot is a relatively high quantum efficiency of 0.4 when ultraviolet light having a wavelength of 350 nm is excitation light. However, in the case of X-ray excitation as in this embodiment, the energy of excitation light is converted to ultraviolet light. Since it is very large, the Auger deactivation process described later occurs, and the quantum efficiency can be further increased.

  FIG. 3 is a diagram for explaining an Auger deactivation process occurring in a semiconductor. (A) is the case where the excitation light is ultraviolet light, and (b) is the case where the excitation light is X-rays. As shown in FIG. 3A, it is shown that by irradiating the quantum dots with ultraviolet rays, electrons in the valence band are excited to the conduction band, and holes are generated in the valence band. In this case, there is no increase in quantum efficiency.

  On the other hand, in the case of FIG. 3B, an increase in quantum efficiency due to the Auger deactivation process is expected. By irradiating the quantum dots with X-rays having energy much higher than that of ultraviolet rays, electrons are excited from the 1s orbit which is the ground state of the valence band to the continuous band. At this time, electrons move one after another to the shallow level of the valence band with respect to holes generated in the 1s orbital. At the same time, other electrons are excited from the valence band to the conduction band one after another by the energy conservation law. It is shown that. This is the Auger deactivation process.

  From this, in the medical drape of an example of the present invention, it is possible to remarkably increase the luminous efficiency by using quantum dots, and it is possible to select and form a compound material that does not contain harmful substances.

  Since it is difficult to directly stack the quantum dots 26 themselves, semiconductor nanoparticles that form the quantum dots 26 are mixed into the filling material 27. Further, the filling material 27 functions as a scaffold material for bonding to the reflective layer 22. As the filling material 27 at this time, it is preferable to use polycarbonate which has radiation resistance and is almost transparent in the visible light region.

  When the quantum dots 26 are mixed with the filling material 27 and applied to the entire medical drape 11, the medical drape may lose flexibility depending on the application thickness. Therefore, in order to maintain this flexibility, it is conceivable that a plurality of grooves 28 are provided in the medical drape, for example, vertically and horizontally. Thus, by making the groove | channel 28 which does not laminate | stack the quantum dot 26 and the filling material 27, the flexibility of the base material sheet 21 is ensured, and also the medical drape 11 is provided by providing the groove | channel 28 so that it may be easy to fold. It becomes possible to store and store cleanly.

  The quantum dots 26 need to be stacked in order to ensure sufficient luminance. Hereinafter, the thickness of the stack will be estimated.

For example, according to a non-patent document (“Radiation Monogatari” written by Kazuyuki Moriuchi, Tsuji Hanafusa Co., Ltd., P.191), “In the case of X-ray imaging of the chest, the monochromatic photon whose X-ray energy is 70 keV on average Assuming a group, it is described that a photon of the order of 5 × 10 ^{8 to} 1.5 × 10 ⁹ [pieces / cm ² ] is irradiated ”. Usually, an adult chest X-ray imaging time is 25 It is said that it is ˜40 [msec]. Therefore, using the average value of the number of photons shown in the above document, it can be seen that the human body is irradiated with photons of the order of 3.1 × 10 ¹⁴ [pieces / m ² · sec].

In the case of the quantum dot having the compound composition of (AgIn) _X Zn _(1-2X) S (silver, indium, zinc, sulfur) shown above, the quantum efficiency is 0.4 (3.1 × 10 ¹⁴ ) × 0.4 = 1.24 × 10 ¹⁴ [pieces / m ² · sec] of fluorescence is generated (the Auger deactivation process is considered later).

Since this emits to a solid angle of 4π [sr], fluorescent photons of 1.24 × 10 ¹⁴ ÷ (4π) = 0.98 × 10 ¹³ [pieces / sr · m ² · sec] are medically draped. 11 will be emitted.

On the other hand, it is defined as 1 [cd] when light having a wavelength of 555 [nm] at which the relative visibility is maximized emits 1/683 [W] of energy per solid angle. Since the energy of one photon having a wavelength of 555 [nm] is 3.24 × 10 ⁻¹⁹ [J], 0.453 × 10 ¹⁶ [pieces / sr · sec from a point light source of 1 [cd]. ] Is emitted. Unit of luminance was [cd / ^{m 2],} for example, high luminance representative brightness of the LCD monitor because it is said to 500 [cd / ^{m 2],} the luminance of 500 [cd / ^{m 2]} and the laminated When trying to achieve with quantum dots, it means that 500 × 0.453 × 10 ¹⁶ = 2.27 × 10 ¹⁸ [pieces / sr · m ² · sec] fluorescent photons are required.

When the quantum dots are stacked, the thickness is very thin, so that the luminance is considered to increase linearly with respect to the X-ray intensity. Furthermore, since the effect of the reflective layer can be expected to be doubled and the contribution due to the Auger deactivation process can be expected to be an order of magnitude or more, if it is assumed to be 10 times now, the number of layers is (2.27 × 10 ¹⁸ ) ÷ (0.98 × 10 ¹³ ). ÷ 2 ÷ 10 = 1.16 × 10 ⁴ , and the thickness calculated therefrom is (3 × 10 ⁻⁹ ) × (1.16 ×) by multiplying the number of stacked layers by setting the diameter of the quantum dots to 3 [nm], for example. 10 ⁴ ) = 34.8 [μm].

  That is, when a subject is seen through with a representative X-ray intensity, a medical drape that emits light with a luminance that is sufficiently visible when exposed to radiation can be realized.

  FIG. 4 is a graph showing the relative visibility with respect to the wavelength defined by the CIE (Commission Internationale de l'Eclairage) standard. The horizontal axis indicates the wavelength, and the vertical axis indicates the relative visibility. When the wavelength is 555 nm, the relative visibility is 1.0. From this figure, it is preferable in terms of efficiency that the fluorescent color of the quantum dot is set in the range of 500 nm to 600 nm in terms of wavelength from green to yellow.

  Further, the wavelength of 555 [nm] is yellowish green, but green is a color that contrasts with the color of blood in the medical field, and since the color ratio visual sensitivity is maximum, the fluorescence wavelength of the quantum dot 26 is set to 555. It may be set in the vicinity of [nm] or even on the green side.

  As described above, it is sufficiently possible to realize the first embodiment of the present invention with a practical layer thickness of quantum dots.

  According to the medical drape of the first embodiment, since it has a structure that emits visible light upon receiving radiation, it is invisible in surgery performed under fluoroscopy, for example, catheter surgery with catheter introduction. If the surgeon is exposed to radiation by mistake, the surgeon can be warned by causing the radiation-exposed region of the medical drape to emit light. Furthermore, since it is possible to eliminate the need to change the X-ray fluoroscopic apparatus, it is possible to provide an alarm at a low cost.

<Second Embodiment>
FIG. 5 is a perspective view of a medical drape according to the second embodiment of the present invention. In 2nd Embodiment, it is a figure which shows the modification when the shape of the lamination | stacking part of the quantum dot 26 of the medical drape 11 is limited not to the medical drape 11 whole surface but to only one part.

  In the first embodiment, the case where the luminescent substance is applied to the entire surface of the medical drape 11 is shown. However, it is sufficient that the radiation generation region can be visually confirmed. Therefore, in the second embodiment, the luminescent layer 23 is partly visible. Also warn by patterns. FIG. 5A shows an enlarged part of the medical drape 11. Here, the light emitting layer 23 is formed in a repeating pattern of a rectangular shape 51.

  As this formation method, the reflective layer 22 is formed on the base material sheet 21, and then a pattern mask is prepared, and the filling material 27 mixed with the quantum dots 26 is applied to the entire medical drape 11. By preparing the pattern mask in this way, the pattern of the light emitting layer 23 can be formed on a part of the medical drape 11.

  As described above, according to the second embodiment, it is possible to improve the flexibility as a medical drape by making a pattern of the light emitting portion, and the operation can be performed using the pattern pattern in addition to the light emitting color. It is possible to give a warning to the person.

  In the first and second embodiments, not only the presence / absence of radiation can be easily determined, but also “fluorescence” having a luminance proportional to the radiation intensity is emitted, so that the approximate radiation intensity can also be easily determined subjectively. Is possible. However, since the luminance perceived by humans is greatly affected by the illuminance of the surrounding environment, it is not possible to make a quantitative determination. Therefore, in the third embodiment, a medical drape capable of visually determining the radiation intensity is realized.

<Third Embodiment>
In this embodiment, a phosphorescence process called phosphorescence is used for the determination of the radiation intensity. First, the difference between fluorescence and phosphorescence will be explained. Fluorescence is emitted when the electrons of the direct transition semiconductor constituting the quantum dot are excited and deactivated in accordance with the spin forbidden law, and the lifetime is several ns to several μs. Deactivation that violates the spin forbidden law does not occur at all, and when it deactivates after staying in the conduction band for a very long time, it is called phosphorescence, and its lifetime ranges from several ms to several s. . In general, a substance that generates phosphorescence is known as a phosphorescent material, and typical materials include strontium aluminate. In addition, although the luminance of the phosphorescent material is slightly lowered, the emission color can be changed by coloring.

  FIG. 6 is a diagram schematically illustrating temporal changes in fluorescence and phosphorescence luminance. FIG. 6A shows the intensity change of the excitation light, the vertical axis represents the X-ray intensity, and the horizontal axis represents time. There are three types of intensity of X-rays that become excitation light, large, medium, and small, which are indicated by solid lines, thick lines, and broken lines, respectively. The irradiation time of the excitation light is set from 0 to T1. FIG. 6B shows the change over time of the luminance of the fluorescent material that emits light with respect to the X-ray excitation light of FIG. In the case of fluorescence, the luminance has a time waveform proportional to the excitation light. On the other hand, FIG. 6C shows a temporal change in phosphorescence brightness, but unlike fluorescence, the brightness is constant regardless of the intensity of excitation light. In the case of phosphorescence, it can be seen that even if the excitation light becomes 0 after T1, it continues to emit light for a while.

  By utilizing this phosphorescence characteristic, it can be understood that a phosphor that has been irradiated with X-rays for a certain period of time does not change in luminance even when the X-ray intensity changes, and thus can be used as a light emitter that emits reference luminance. .

  FIG. 7 is a perspective view of a medical drape according to the third embodiment of the present invention. FIG. 8 is a diagram showing a cross-sectional structure taken along lines C and D in FIG.

  Similar to the first embodiment, the medical drape of the present embodiment receives the radiation on the base material sheet 21 that is the fabric of the medical drape, the reflective layer 22 that reflects visible light thereon, and the upper portion thereof. The light emitting layer 23 emits visible light.

  As shown in the enlarged view of FIG. 7A, the light emitting layer 23 includes a region 71 in which a fluorescent material that emits light in proportion to the intensity of excitation light is laminated, and phosphorescence that emits constant light regardless of the intensity of the excitation light. The region 72 where the materials are laminated is arranged in a circularly adjacent structure like a double circle, and this circular structure is repeatedly formed on the medical drape 11. This circular structure makes it possible to visually determine the radiation exposure amount. Hereinafter, this circular structure is referred to as a determination region 73.

  In the radiation intensity used in normal X-ray fluoroscopic conditions, the number of X-ray photons per unit area is much smaller than the number of quantum dots per unit area and the fluorescence lifetime is very small. Can emit fluorescent photons in proportion to the radiation intensity. Thereby, the luminance can be changed in proportion to the radiation intensity.

  In the region 72 where the phosphorescent material is laminated, the emission wavelength of the phosphorescent material is determined by the material, but in the region 71 where the fluorescent material is laminated, the fluorescence wavelength can be controlled by adjusting the particle diameter of the quantum dots. .

  Therefore, the particle diameter of the quantum dots 26 in the region 71 where the fluorescent material is laminated is controlled so as to coincide with the emission wavelength of the region 72 where the phosphorescent material is laminated. The stack thickness is controlled so that the saturation luminance matches.

  As a result, the region 71 where the fluorescent material is laminated shines darker than the region 72 where the phosphorescent material is laminated below a certain radiation intensity, and conversely, when it exceeds that, the region 71 shines brighter and the X-ray intensity is easily increased. It is possible to determine visually.

  In this determination area 73, it is desirable that the area 71 and the area 72 are close to each other in order to facilitate luminance comparison, and it is possible to determine at a glance where (or which) the area 72 where the phosphorescent material is laminated is. The shape is preferably designed. That is, it is preferable that the region 71 and the region 72 have different shapes. In FIG. 8, a light emitting layer made of a fluorescent material is provided at a place other than the determination area 73, but it may not be provided if the determination area 73 alone gives a sufficient warning.

  FIG. 9 is a diagram showing a modification of the shape of the determination region 73 formed in the medical drape according to the third embodiment of the present invention. FIG. 9A shows the circular pattern described above, and FIG. 9B shows a rectangular pattern. In FIG. 9 (b), a region 91 that emits phosphorescence and a region 92 that emits fluorescence are distinguished, and in order to identify which region the phosphorescent material is laminated, the two shapes are not the same. . Various modifications of the shape of the determination region 73 can be considered. However, it is preferable that the shape of the determination region 73 is not the same shape and is neither a point symmetry nor a line symmetry because the X-ray intensity can be easily identified.

  According to the third embodiment, there is an effect that the radiation intensity can be visually determined by providing, in a part of the medical drape, an area in which it is possible to determine whether or not the radiation intensity is greater or less than a predetermined reference level by the light emission luminance. .

  According to the medical drape according to the present invention, the radiation region is emitted to the medical drape used to cover the subject in an operation performed under fluoroscopy, for example, a catheter operation with catheter introduction. Therefore, it is possible to prevent the operator from being exposed to invisible radiation by mistake.

  In addition, since this medical drape warns with its own light, it is possible to reduce oversight of radiation exposure due to shielding of surgical instruments and the like. Furthermore, since there is no need to change the X-ray fluoroscopy device or the like, there is an effect that warning can be made at low cost.

  Further, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements over different embodiments may be appropriately combined. As long as the technical idea of the present invention is used, these modified examples are also included in the present invention.

  DESCRIPTION OF SYMBOLS 11 ... Medical drape, 12 ... X-ray source, 21 ... Base material sheet, 22 ... Reflective layer, 23 ... Light emitting layer, 24 ... Radiation, 25 ... Visible light, 26 ... Quantum dot, 27 ... Filling material, 28 ... Groove 73 determination region.

Claims (6)

  It is characterized by laminating a reflective layer made of a metal that reflects visible light and a light emitting layer that emits visible light by X-ray excitation having energy of 10 eV or more on a base sheet having radiation resistance and elasticity. A medical drape.   The light emitting layer is composed of at least one of a first region having a light emission luminance that is substantially proportional to the X-ray intensity to be irradiated and a second region having a substantially constant luminance regardless of the radiation intensity to be irradiated. The medical drape according to claim 1, wherein   The light-emitting substance used for the first region of the light-emitting layer is a non-biotoxic material that fluoresces with respect to X-ray excitation light. In the second region, phosphorescence is generated with respect to the X-ray excitation light. 3. The medical drape according to claim 2, wherein the medical drape is a material that does not emit biotoxicity.   The light emitting substance used in the first region of the light emitting layer is a semiconductor quantum dot whose light emission wavelength can be controlled by the particle diameter, and the particle diameter is adjusted in advance so as to obtain a desired light emission wavelength. A medical drape according to claim 3.   The medical drape according to claim 2, wherein the light emitting layer is formed on the entire surface or a part of the base sheet.   5. The medical use according to claim 4, wherein the light emitting layer is formed by mixing the quantum dots in a filling material having radiation resistance and transparency in the visible light region and applying the mixture. drape