CN112946715B

CN112946715B - High radiation dose measurement method and system

Info

Publication number: CN112946715B
Application number: CN202110162591.2A
Authority: CN
Inventors: 戴志敏; 侯会良; 林健; 陆黄杰; 黄跃峰; 王建强; 钱渊
Original assignee: Shanghai Institute of Applied Physics of CAS
Current assignee: Shanghai Institute of Applied Physics of CAS
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2022-07-26
Anticipated expiration: 2041-02-05
Also published as: CN112946715A

Abstract

The invention relates to a high radiation dose measuring method and a system, the method comprises the steps of collecting visible fluorescence data generated by ultraviolet excitation of a Th-SINAP crystal dose slice after receiving a reading instruction; screening and removing the part of the visible fluorescence data which is affected by using ultraviolet as an excitation light source to obtain actual visible fluorescence data; and reading a corresponding dose value on a relation curve of the visible fluorescence data and the dose determined by a calibration experiment according to the actual visible fluorescence data, and calculating the real-time dose rate. According to the invention, the radiation dose is measured by exciting fluorescence by ultraviolet and collecting fluorescence color, and the influence caused by ultraviolet as an excitation light source in visible fluorescence data is eliminated, so that the problems of long dose data acquisition time, complex data acquisition steps and inaccurate dose value reading in the process of measuring high radiation dose (Gy/h-MGy/h magnitude) in the traditional technology are solved.

Description

High radiation dose measurement method and system

Technical Field

The invention relates to the technical field of radiation dose detection, in particular to a high radiation dose measuring method and system.

Background

The technical field of nuclear science in China is rapidly developed, and radioactive isotopes and related irradiation devices and technologies are widely applied to the fields of industry, agriculture, medical health, geological survey and the like, wherein the determination of ionizing radiation dose plays a very important role in application scenes of irradiation sterilization, nuclear medicine, high-radioactive waste monitoring and the like.

The current methods for determining radiation dose mainly include: 1) reading out the radiation dose value by using a thermoluminescence dose plate based on the thermoluminescence principle; 2) determining a radiation dose value according to the color of the label after irradiation by using the irradiation color-changing indication label; 3) and performing signal processing by using the scintillator and a photoelectric conversion device through a rear-end electronics system, and finally calculating through data processing to obtain a radiation dose value. In the method 1, the method of measuring the radiation dose value by using the thermoluminescent dose sheet needs to heat the dose sheet when the dose value is read out, and needs to heat according to a set temperature curve, so that the required time is long, and the measurement of real-time read dose and real-time dose rate cannot be realized; in the method 2, the irradiation color-changing indicator label can only be used as disposable detection test paper, when the dosage value is read, the dosage value needs to be read by comparing with a standard indicator label through visual observation, only the irradiation dosage can be identified semi-quantitatively, and quantitative measurement cannot be realized; in addition, in the 3 rd method, the nuclear radiation particles act on the scintillator to generate fluorescence, the energy of the particles is in direct proportion to the number of generated fluorescence photons, the fluorescence is converted into an electric signal through the photomultiplier, the number of the fluorescence photons is in direct proportion to the signal amplitude value output by the photomultiplier, a rear-end electronic system is used for processing the pulse signal and then converting the pulse signal into a dose (rate) value through calculation, errors often exist in the conversion process to cause inaccuracy of the read dose value, and the method is not suitable for being used in a high-dose radiation field, such as real-time accurate reading of the dose rate in a strong radiation field (Gy/h-MGy/h magnitude).

Therefore, the radiation dosimetry method has the problems of long dose data acquisition time, complex data acquisition steps and inaccurate dose value reading.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the problems of long dose data acquisition time, complex data acquisition steps and inaccurate dose value reading of the radiation dosimetry method in the prior art.

In order to solve the above technical problems, an object of the present invention is to provide a high radiation dose measuring method, including:

collecting visible fluorescence data generated by ultraviolet excitation of the Th-SINAP crystal dose piece after receiving a reading instruction;

screening and removing the part of the visible fluorescence data which is affected by using ultraviolet as an excitation light source to obtain actual visible fluorescence data;

and reading a corresponding dose value on a relation curve of the visible fluorescence data and the dose determined by a calibration experiment according to the actual visible fluorescence data, and calculating the real-time dose rate.

In one embodiment of the present invention, the acquiring the visible fluorescence data generated by the Th-SINAP crystal after being excited by ultraviolet light after receiving the reading instruction comprises:

after receiving the reading instruction, the ultraviolet LED lamp is turned on, and the Th-SINAP crystal dose piece is irradiated by ultraviolet light to generate visible fluorescence;

collecting visible fluorescence data generated by the Th-SINAP crystal dose slice, and converting the visible fluorescence data into a first RGB value;

turning off the ultraviolet LED lamp after the first RGB value is read.

In an embodiment of the present invention, the screening and rejecting a portion of the visible fluorescence data affected by using ultraviolet as an excitation light source to obtain actual visible fluorescence data includes:

and measuring all RGB values of visible fluorescence generated by ultraviolet excitation of the dose piece of the Th-SINAP crystal which is not irradiated in advance, storing the RGB values to define as a second RGB value, and subtracting the second RGB value from the first RGB value which is actually measured to obtain an actual RGB value which is actually measured.

In one embodiment of the present invention, determining in advance all RGB values of visible fluorescence generated by uv excitation of a dose of Th-SINAP crystal that has not been irradiated, and defining the RGB values as second RGB values, and subtracting the second RGB values from the first RGB values that were actually measured to obtain actual RGB values comprises:

the operation of collecting visible fluorescence data generated by ultraviolet excitation of the Th-SINAP crystal dose piece after receiving a reading instruction is executed for multiple times by using the Th-SINAP crystal dose piece which is not irradiated, a second RGB value obtained by executing the operation each time and corresponding execution times are recorded, and the second RGB value and the corresponding execution times are recorded as an array b [ i ], wherein i is the measurement times, and b [ i ] is the second RGB value obtained by the ith measurement;

recording a first RGB value obtained in actual measurement and corresponding execution times as an array ci, wherein i is the measurement times, and ci is the first RGB value obtained in the ith actual measurement;

and subtracting the array b [ i ] from the array c [ i ] to obtain the actually measured actual RGB value.

In an embodiment of the present invention, a corresponding dose value is read on a graph of the visible fluorescence data versus the dose determined by a calibration experiment according to the actual visible fluorescence data, wherein the graph of the visible fluorescence data versus the dose determined by the calibration experiment includes:

placing the Th-SINAP crystal dose tablet in a radiation field with a known dose rate to obtain an RGB value of visible fluorescence generated by the Th-SINAP crystal dose tablet and a corresponding dose value;

and fitting an RGB-dose curve graph according to the relationship between the RGB values and the dose values.

In one embodiment of the invention, calculating the real-time dose rate comprises:

and subtracting the dose values measured in two adjacent times and then dividing the dose values by the time difference of the two measurements to obtain the real-time dose rate.

Another object of the present invention is to provide a high radiation dosimetry system comprising:

the acquisition module is used for acquiring visible fluorescence data generated by ultraviolet excitation of the Th-SINAP crystal dose piece after receiving the reading instruction;

the screening module is used for screening and eliminating the part of the visible fluorescence data which is influenced by using ultraviolet as an excitation light source to obtain actual visible fluorescence data;

and the data reading and calculating module is used for reading a corresponding dose value on a relation curve of the visible fluorescence data and the dose determined by a calibration experiment according to the actual visible fluorescence data and calculating the real-time dose rate.

In one embodiment of the invention, the acquisition module comprises:

the ultraviolet LED control unit is used for utilizing ultraviolet as an excitation light source to enable the Th-SINAP crystal dose slice to generate visible fluorescence;

and the color sensing unit is used for acquiring visible fluorescence data generated by ultraviolet excitation of the Th-SINAP crystal dose piece.

In one embodiment of the present invention, the data reading calculation module includes:

and the main control unit is used for controlling the acquisition module and the screening module, reading a corresponding dose value on a relation curve between visible fluorescence data and dose determined by a calibration experiment according to the actual visible fluorescence data, and calculating the real-time dose rate.

In one embodiment of the invention, the screening module comprises:

and the storage definition unit is used for measuring all RGB values of visible fluorescence generated by the irradiated Th-SINAP crystal dose slice excited by ultraviolet in advance, and the storage definition unit is used for defining the second RGB values and storing the second RGB values in the main control unit.

Compared with the prior art, the technical scheme of the invention has the following advantages:

according to the invention, the radiation dose is measured by exciting fluorescence by ultraviolet and collecting fluorescence color, and the influence caused by ultraviolet as an excitation light source in visible fluorescence data is eliminated, so that the problems of long dose data acquisition time, complex data acquisition steps and inaccurate dose value reading in the traditional technology for measuring high radiation dose (Gy/h-MGy/h magnitude) are solved.

Drawings

In order that the present disclosure may be more readily understood, a more particular description of the disclosure will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings

Fig. 1 is a schematic flow chart of a high radiation dose measurement method of the present invention.

FIG. 2 is a graph of RGB values of visible fluorescence versus dose determined using calibration experiments in a high radiation dose measurement method of the present invention.

Fig. 3 is a schematic diagram of a high radiation dosimetry system of the invention.

Fig. 4 is a schematic circuit diagram of a main control unit in a high radiation dose measuring system according to the present invention.

FIG. 5 is a schematic circuit diagram of a color sensing unit in a high radiation dosimetry system of the invention.

Fig. 6 is a schematic circuit diagram of the uv LED control unit in a high radiation dosimetry system of the invention.

Fig. 7 is a schematic circuit diagram of a USB communication control unit in a high radiation dose measuring system according to the present invention.

The specification reference numbers indicate: 10. a probe; 20. a host; 200. an ultraviolet LED control unit; 210. a color sensing unit; 220. a main control unit; 230. a USB communication control unit; 30. an optical fiber.

Detailed Description

The present invention is further described below in conjunction with the drawings and the embodiments so that those skilled in the art can better understand the present invention and can carry out the present invention, but the embodiments are not to be construed as limiting the present invention.

The Th-SINAP series crystal material can generate irradiation photoluminescence change after being irradiated by ultraviolet rays, X rays, gamma rays and beta rays, the irradiated crystal material can generate obvious visible fluorescence under the excitation of the ultraviolet rays, the color of the fluorescence can change along with the dosage absorbed by the crystal material, the green component in the fluorescence can be obviously enhanced along with the increase of the absorbed dosage, and the fluorescence component is linearly related to the absorbed dosage. One embodiment of the present invention therefore provides a high radiation dosimetry system based on the characteristics of the Th-SINAP series of crystalline materials.

Referring to fig. 3, the high radiation dose measuring system of the present invention includes a probe 10 and a host 20, and the probe 10 and the host 20 are connected by an optical fiber 30, and can be used for two operating modes, including real-time dose (rate) measurement and off-line measurement in a high radiation field. In the real-time measurement working mode, the probe 10 is partially placed in a high-level radiation field, the host 20 is placed in a safe area, and the probe 10 is connected with the host 20 through the optical fiber 30; in the off-line measurement mode of operation, the optical fiber 30 may be removed to allow the dose value to be read by directly placing a dose patch of the Th-SINAP crystal on the host 20.

The invention adopts the Th-SINAP crystal dosage piece to accurately measure the dosage from kGy to MGy.

With continued reference to fig. 3, the host 20 includes a motherboard, and the motherboard integrates a collection module, a screening module, and a data reading and calculating module. Specifically, the acquisition module includes an ultraviolet LED control unit 200 and a color sensing unit 210, the ultraviolet LED control unit 200 includes an ultraviolet LED, the color sensing unit 210 includes a color sensor, one of the optical fibers 30 is connected to the ultraviolet LED for conducting ultraviolet rays into the probe 10, and the other optical fiber 30 is connected to the color sensor for conducting visible fluorescence generated by the stimulated emission of the Th-SINAP crystal dose patch in the probe 10. The data reading and calculating module comprises a main control unit 220, the main control unit 220 comprises a main control chip, and the main control chip is used for controlling the acquisition module and the screening module, and simultaneously reading a corresponding dose value on a relation curve between visible fluorescence data and dose determined by a calibration experiment according to actual visible fluorescence data, and calculating real-time dose rate. And the screening module comprises a storage definition unit, measures all RGB values of visible fluorescence generated by ultraviolet excitation of the dose piece of the Th-SINAP crystal which is not irradiated in advance, defines the RGB values as second RGB values through the storage definition unit and stores the second RGB values in the main control unit 220.

In a preferred embodiment, as shown in fig. 4, the circuit of the main control chip is an STM32F103C8T6 single chip, and pins PA1, PB11, PA12, and PB9 of the single chip are used for controlling the switching of the ultraviolet LED. PA13 and PA14 are burning ports of the chip debugging program. PB6, PB7 are SCL and SDA ports of the IIC bus, and are connected with

pins

2 and 6 of the color sensor for controlling parameters of the color sensor and reading data of the color sensor, the

pins

2 and 6 need to be connected to a +3.3V power supply through pull-up resistors R12 and R11, and the pin PB8 is used for an interrupt mode of the color sensor. The color sensor is a TCS7472 sensor used for collecting fluorescence generated by ultraviolet light excitation of the Th-SINAP crystal dosage tablet and transmitting data to the main control chip through an IIC bus, and a specific circuit is shown in figure 5.

As shown in fig. 6, the ultraviolet LED control unit 200 is driven by an NPN transistor, the +5V power supply is connected to the anode of the ultraviolet LED, the cathode of the ultraviolet LED is connected to the collector of the transistor, the control pin of the single chip microcomputer is connected to the base of the transistor through a 1.1k Ω resistor, the emitter of the transistor is connected to ground, when the control pin of the single chip microcomputer outputs a high level, the ultraviolet LED is turned on to emit light, and when the control pin outputs a low level, the ultraviolet LED is turned off.

As shown in fig. 7, the present embodiment further includes a USB communication control unit 230, the USB communication control unit 230 connects serial ports TXD and RXD of the single chip microcomputer, which uses a serial to USB protocol chip CP2102, the serial ports TXD and RXD of the single chip microcomputer respectively pass through two pull-up resistors of 10k Ω to a 3.3V power supply, and then connect 25 and 26 pins of the CP2102 chip, pin RST 9 of the CP2102 is connected to pin VDD of no 6 through 4.7k Ω, pin D + of the CP2102 chip and pin D-5 are connected to the MINI-USB mother socket, pin ni 11 of the CP2102 is connected to an anode of the led through a resistor of 1.1k Ω, and a cathode of the led is connected to ground.

Based on the high radiation dose measurement system shown in fig. 1, another embodiment of the present invention provides a high radiation dose measurement method, including the steps of:

in step S101, after receiving a reading instruction, collecting visible fluorescence data generated by ultraviolet excitation of the Th-SINAP crystal dose slice.

Illustratively, after a reading instruction is received, the main control chip controls the ultraviolet LED to be turned on, the Th-SINAP crystal dose slice is irradiated by ultraviolet light to generate visible fluorescence, at the moment, the main control chip controls the color sensor to collect visible fluorescence data generated by the Th-SINAP crystal dose slice, the visible fluorescence data are converted into a first RGB value, the first RGB value is sent to the main control chip, and the main control chip turns off the ultraviolet LED lamp after the first RGB value is read. The reading instruction can be sent by an upper computer or can be triggered by a key on a main control chip or an instrument at regular time.

Illustratively, the operation mode, integration time, and gain of the color sensor need to be set in advance. To ensure the accuracy of the data, the integration time was set to 154 milliseconds and the gain multiple was set to 60 times.

In step S102, the part of the visible fluorescence data affected by the ultraviolet light as the excitation light source is screened and removed to obtain the actual visible fluorescence data.

Illustratively, since Th-SINAP crystal dose tablets are equally sensitive to uv light and ionizing radiation, the use of uv light as the excitation light source affects the reading of dose (rate) values, i.e., the RGB values change due to both the ionizing radiation and the uv light, and therefore the read data needs to be subtracted from the uv light affected portion. The method adopted by the embodiment is as follows: and measuring all RGB values of visible fluorescence generated by ultraviolet excitation of the Th-SINAP crystal dose piece which is not irradiated in advance, defining the RGB values as second RGB values, storing the second RGB values on the main control chip, and subtracting the second RGB values from the actually measured first RGB values to obtain actually measured actual RGB values. Specifically, the operation of collecting visible fluorescence data generated by ultraviolet excitation of the Th-SINAP crystal dose piece after receiving a reading instruction is executed for multiple times by using the Th-SINAP crystal dose piece which is not irradiated in advance, a second RGB value obtained by executing the operation each time and corresponding execution times are recorded, and the second RGB value and the corresponding execution times are recorded as an array b [ i ], wherein i is the measurement times, and b [ i ] is the second RGB value obtained by the ith measurement; during actual measurement, recording a first RGB value obtained during actual measurement and corresponding execution times as an array ci, wherein ci is the first RGB value obtained by the ith actual measurement; and subtracting the array b [ i ] from the array c [ i ] to obtain an actual RGB value which is the actual RGB value after the influence of the ultraviolet light is subtracted, and subtracting the influence caused by the ultraviolet light from the measured value every time.

In step S103, a corresponding dose value is read on a relationship curve between the visible fluorescence data and the dose determined by a calibration experiment according to the actual visible fluorescence data, and a real-time dose rate is calculated.

Exemplarily, the curve of the relationship between the visible fluorescence data and the dose, which is determined by using a calibration experiment, comprises the steps of placing a Th-SINAP crystal dose slice in a radiation field with a known dose rate, and obtaining RGB values and corresponding dose values of the visible fluorescence generated by the Th-SINAP crystal dose slice; fitting an RGB-dose curve graph according to the relationship between the RGB values and the dose values, wherein the RGB-dose curve graph can be shown by referring to FIG. 2, the approximate linear region of a G value curve in the graph is 3 segments, the 1 st segment is 0Gy to 3500Gy, and the RGB-dose relationship of the approximate linear region meets the condition that D is (G-105.988)/0.0167; the 2 nd segment is 3500Gy to 9500Gy, and the RGB-dose relation of the approximate linear region of the segment meets the requirement that D is (G + 14.23)/0.0213; the 3 rd segment is 9500Gy to the maximum measuring range, and the RGB-dose relation of the approximate linear region of the segment meets the condition that D is (G-190.525)/0.0002083, wherein G is the G value in RGB, and D is the dose corresponding to the RGB value. Therefore, during data processing, the RGB values obtained from the unknown radiation field are substituted into the fitting curve, and the dose value of the radiation field at the corresponding position can be obtained. And subtracting the dose values measured twice in the dose rate measuring mode, and then dividing the subtracted dose values by the time difference of the two measurements to obtain the real-time dose rate.

The invention uses the color sensor and the ultraviolet LED to ensure that the relation between the photoluminescence change of the Th-SINAP crystal and the dosage value can be accurately determined, the switch of the ultraviolet LED, the configuration of the color sensor and the data reading can be automatically carried out through the micro main control chip, the real-time quick reading of the dosage (rate) value is realized, and compared with the method of taking color by using color taking software after photographing and then deducing the dosage, the method is quicker and more accurate, and simultaneously the Th-SINAP crystal can be also suitable for the real-time dosage (rate) measurement.

The invention can also change the ultraviolet LED into a white light LED which can be used for quantitative measurement of the corresponding relation of the color dose of the irradiation color-changing indicating label, and compared with a method for identifying the color change of the irradiated indicating label by naked eyes, the method is more accurate due to the high resolution of the color sensor. Because the measurement is the accumulated dose, and the ultraviolet excitation fluorescence spectrum of the Th-SINAP crystal is obviously linearly related with the change of the dose at the same time, the invention is more accurate than the traditional instrument consisting of a Gege tube or a scintillator and a photomultiplier, and can measure the dose (rate) in a high-radioactivity environment, and the reading process of the dose value does not need heating, the reading time of the dose value is less than 1 second, and meanwhile, the online real-time measurement can be realized.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Various other modifications and alterations will occur to those skilled in the art upon reading the foregoing description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims

1. A high radiation dosimetry method comprising:

after receiving a reading instruction, collecting visible fluorescence data generated by ultraviolet excitation of the Th-SINAP crystal dose piece;

screening and removing the part of the visible fluorescence data, which is affected by ultraviolet serving as an excitation light source, to obtain actual visible fluorescence data, wherein all RGB values of visible fluorescence generated by ultraviolet excitation of the Th-SINAP crystal dose slice which is not irradiated are measured in advance, stored and defined as a second RGB value, and the actually measured actual RGB value is obtained by subtracting the second RGB value from the actually measured first RGB value:

recording a first RGB value obtained in actual measurement and corresponding execution times as an array ci, wherein i is the measurement times, and ci is a first RGB value obtained in the ith actual measurement;

subtracting the array b [ i ] from the array c [ i ] to obtain an actual RGB value of actual measurement;

2. A high radiation dose measuring method according to claim 1, characterized in that: after receiving the reading instruction, acquiring visible fluorescence data generated by ultraviolet excitation of the Th-SINAP crystal comprises the following steps:

turning off the ultraviolet LED lamp after the first RGB value is read.

3. A high radiation dose measuring method according to claim 1, wherein: reading a corresponding dose value on a relation curve of the visible fluorescence data and the dose determined by a calibration experiment according to the actual visible fluorescence data, wherein the relation curve of the visible fluorescence data and the dose determined by the calibration experiment comprises:

placing the Th-SINAP crystal dose tablet in a radiation field with a known dose rate to obtain an RGB value and a corresponding dose value of visible fluorescence generated by the Th-SINAP crystal dose tablet;

and fitting an RGB-dose curve graph according to the relationship between the RGB value and the dose value.

4. A high radiation dose measuring method according to claim 1, characterized in that: calculating the real-time dose rate comprises:

5. A high radiation dosimetry system comprising:

the screening module is used for screening and eliminating the part of the visible fluorescence data which is affected by using ultraviolet as an excitation light source to obtain actual visible fluorescence data, the actual visible fluorescence data comprises all RGB values of visible fluorescence generated by ultraviolet excitation of a Th-SINAP crystal dose slice which is not irradiated, which are measured in advance, the RGB values are stored and defined as second RGB values, and the actually measured actual RGB values are obtained by subtracting the second RGB values from the actually measured first RGB values:

and the data reading and calculating module is used for reading a corresponding dose value on a relation curve of the visible fluorescence data and the dose determined by a calibration experiment according to the actual visible fluorescence data, and calculating the real-time dose rate.

6. A high radiation dosimetry system according to claim 5 wherein the acquisition module comprises:

the ultraviolet LED control unit is used for utilizing ultraviolet as an excitation light source to enable the Th-SINAP crystal dose piece to generate visible fluorescence;

7. A high radiation dosimetry system according to claim 5 wherein the data reading computation module comprises:

and the main control unit is used for controlling the acquisition module and the screening module, reading a corresponding dose value on a relation curve between the visible fluorescence data and the dose determined by a calibration experiment according to the actual visible fluorescence data, and calculating the real-time dose rate.

8. A high radiation dosimetry system according to claim 5, wherein said screening module comprises: