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ABSTRACT
PURPOSE： The purpose of this study was to assess the possibility of measuring radiation dose based on primary color chrominance in chemical solutions.
METHODS： We used an aqueous solution with different concentrations of Alphaurine A and Tracid Brilliant Red B. This was irradiated by 1.5-13.5kGy 60Co γ radiation. Data were collected by an instrument that can detect information on the three primary colors. Data were analyzed and manipulated for each experiment.
RESULTS AND CONCLUSIONS： The result shows that three primary colors chrominance in the aqueous solutions change with different doses of 60Co γ-rays and different concentrations of Alphaurine A and Tracid Brilliant Red B. For Alphaurine A， the red chrominance is gradually reduced as a function of radiation dose. The blue chrominance gradually increases concurrently. The red and green chrominance changes obviously and inversely， but the green chrominance changes little. In Tracid Brilliant Red B solution， the red chrominance and green chrominance gradually decreases as the radiation dose increases. And the changes are obvious and inverted. The blue chrominance changed little. Our experiments demonstrate that radiation dose can be studied based on three primary colors chrominance. This may be a new tool to measure radiation dose.
KEYWORDS： Three primary colors （RGB）；Alphaurine A；Tracid Brilliant Red B；Radiation dose
1.INTRODUCTION
Chemical ionizing-radiation detectors measure the absorption of different kinds of radiation. The chemical method in ionizing-radiation dosimetry has been known for a long time[1，2]. Chemical ionizing-radiation dosimeters have well-known advantages. Detectors have different dosimetric characteristics according to the fields in which they have been used. The most important criterion is usually a linear relationship between radiation dose and reported signal. There are a number of chemical dosimeters each with different approaches to measuring dose. While the spectrophotometric method is the most common， it is also complicated and slow.
Theoretical and experimental studies have shown that it is possible to select solutions that change color when exposed to ionizing radiation [3]. Thus， the solution color is a measure of radiation at a given energy. Here， we developed such a sensor and focus on the three primary colors （Red， Green and Blue， RGB）.
2.MATERIALS AND METHODS
We weighed different masses of the dye Alphaurine A and dye Tracid Brilliant Red B with a digital analytical balance. Then we dissolved the solutions at 500mg/L， 250mg/L， 150mg/L， 125mg/L，and 62.5mg/L. Separately， we took 5mL of each and transferred to 10mL airtight plastic tubes. These were stored at room temperature for irradiation with 60Co γ （1.5～13.5kGy）. We used the RGB detector to get the three primary color data （Red， Green， and Blue） for all the experimental samples separately. Then they were recorded and analyzed. Stability testing included the effect of time and temperature on the samples. These were kept in the sunlight at 25～350C for two weeks followed by repeat analysis as above. 3.RESULTS
3.1Different 60Co γ - radiation doses and concentration of Alphaurine A affect three primary colors chrominance
The RGB chrominance of the Alphaurine A solution （500 mg/L， 250mg/L， and 150mg/L） changes with radiation dose from 1.5～15kGy 60Co γ ray. In 500mg/L group， the red color gradually increased with irradiation dose from 1.5 to 13.5kGy. The green is relatively stable， but the blue decreases. In 250mg/L group， the red increases as a function of radiation dose， but plateaus at 7.5kGy. The green has a slight change， and blue decreases up to 7.5kGy. In 150mg/L group， the red color gradually increases as a function of radiation dose， but the increase plateaus at 4.5kGy. The green is relatively stable， and blue decreases until 4.5kGy.
3.2Different 60Co γ radiation doses and concentrations of Tracid Brilliant Red B solution affect the three primary colors
The RGB chrominance of the Tracid Brilliant Red B solution changes with radiation dose from 1.5～15kGy 60Co γ radiation. The results showed that the red channel decreased as a function of irradiation dose. Green increased， but both changed little after 7.5Gy（in 250mg/L group）and 4.5Gy（in 150mg/L group. Blue was quite stable）.
3.3Effect of the preserve times on the experimental result
For stability testing， the 250mg/L Alphaurine A and 250 mg/L Tracid Brilliant Red B samples were stored in summer conditions （under sunlight during the days with temperature from 25～350C） for two weeks. Then， we repeated this test and compared the RGB data. There were no significant changes （p>0.05）.
4.Discussion
The basic principle of liquid radiation dosimetry is absorption spectroscopy， which detects absorbance changes from the irradiated solution. We studied the dose with three color channels and different concentrations of Alphaurine A and Tracid Brilliant Red B. This method is more stable and simple than alternatives. Importantly， a broader range of dose detection is possible with more sophisticated chemical reagents. There are few similar papers using the color-radiation dose relationship. If improved， this approach may offer an important alternative to the traditional dosimeter.
REFERENCES
[1]Stabin， M.a ， Xu， X.G.b. Basic Principles in the Radiation Dosimetry of Nuclear Medicine. Seminars in Nuclear Medicine. Volume 44， Issue 3， May 2014， 162-171
[2]Kabakchi A. M.， Havrentovaya Y.， Penkovskii V. V.， Chemical Dosimetry of Ioniszing Radiation， Kiev， ANUSSDR， 1983.
[3]Kozlov V. F.， Radiation Safety， Moscow， Energoatom Izdat， 1987.Equipment， 01/2007； 582（2）：484-488
PURPOSE： The purpose of this study was to assess the possibility of measuring radiation dose based on primary color chrominance in chemical solutions.
METHODS： We used an aqueous solution with different concentrations of Alphaurine A and Tracid Brilliant Red B. This was irradiated by 1.5-13.5kGy 60Co γ radiation. Data were collected by an instrument that can detect information on the three primary colors. Data were analyzed and manipulated for each experiment.
RESULTS AND CONCLUSIONS： The result shows that three primary colors chrominance in the aqueous solutions change with different doses of 60Co γ-rays and different concentrations of Alphaurine A and Tracid Brilliant Red B. For Alphaurine A， the red chrominance is gradually reduced as a function of radiation dose. The blue chrominance gradually increases concurrently. The red and green chrominance changes obviously and inversely， but the green chrominance changes little. In Tracid Brilliant Red B solution， the red chrominance and green chrominance gradually decreases as the radiation dose increases. And the changes are obvious and inverted. The blue chrominance changed little. Our experiments demonstrate that radiation dose can be studied based on three primary colors chrominance. This may be a new tool to measure radiation dose.
KEYWORDS： Three primary colors （RGB）；Alphaurine A；Tracid Brilliant Red B；Radiation dose
1.INTRODUCTION
Chemical ionizing-radiation detectors measure the absorption of different kinds of radiation. The chemical method in ionizing-radiation dosimetry has been known for a long time[1，2]. Chemical ionizing-radiation dosimeters have well-known advantages. Detectors have different dosimetric characteristics according to the fields in which they have been used. The most important criterion is usually a linear relationship between radiation dose and reported signal. There are a number of chemical dosimeters each with different approaches to measuring dose. While the spectrophotometric method is the most common， it is also complicated and slow.
Theoretical and experimental studies have shown that it is possible to select solutions that change color when exposed to ionizing radiation [3]. Thus， the solution color is a measure of radiation at a given energy. Here， we developed such a sensor and focus on the three primary colors （Red， Green and Blue， RGB）.
2.MATERIALS AND METHODS
We weighed different masses of the dye Alphaurine A and dye Tracid Brilliant Red B with a digital analytical balance. Then we dissolved the solutions at 500mg/L， 250mg/L， 150mg/L， 125mg/L，and 62.5mg/L. Separately， we took 5mL of each and transferred to 10mL airtight plastic tubes. These were stored at room temperature for irradiation with 60Co γ （1.5～13.5kGy）. We used the RGB detector to get the three primary color data （Red， Green， and Blue） for all the experimental samples separately. Then they were recorded and analyzed. Stability testing included the effect of time and temperature on the samples. These were kept in the sunlight at 25～350C for two weeks followed by repeat analysis as above. 3.RESULTS
3.1Different 60Co γ - radiation doses and concentration of Alphaurine A affect three primary colors chrominance
The RGB chrominance of the Alphaurine A solution （500 mg/L， 250mg/L， and 150mg/L） changes with radiation dose from 1.5～15kGy 60Co γ ray. In 500mg/L group， the red color gradually increased with irradiation dose from 1.5 to 13.5kGy. The green is relatively stable， but the blue decreases. In 250mg/L group， the red increases as a function of radiation dose， but plateaus at 7.5kGy. The green has a slight change， and blue decreases up to 7.5kGy. In 150mg/L group， the red color gradually increases as a function of radiation dose， but the increase plateaus at 4.5kGy. The green is relatively stable， and blue decreases until 4.5kGy.
3.2Different 60Co γ radiation doses and concentrations of Tracid Brilliant Red B solution affect the three primary colors
The RGB chrominance of the Tracid Brilliant Red B solution changes with radiation dose from 1.5～15kGy 60Co γ radiation. The results showed that the red channel decreased as a function of irradiation dose. Green increased， but both changed little after 7.5Gy（in 250mg/L group）and 4.5Gy（in 150mg/L group. Blue was quite stable）.
3.3Effect of the preserve times on the experimental result
For stability testing， the 250mg/L Alphaurine A and 250 mg/L Tracid Brilliant Red B samples were stored in summer conditions （under sunlight during the days with temperature from 25～350C） for two weeks. Then， we repeated this test and compared the RGB data. There were no significant changes （p>0.05）.
4.Discussion
The basic principle of liquid radiation dosimetry is absorption spectroscopy， which detects absorbance changes from the irradiated solution. We studied the dose with three color channels and different concentrations of Alphaurine A and Tracid Brilliant Red B. This method is more stable and simple than alternatives. Importantly， a broader range of dose detection is possible with more sophisticated chemical reagents. There are few similar papers using the color-radiation dose relationship. If improved， this approach may offer an important alternative to the traditional dosimeter.
REFERENCES
[1]Stabin， M.a ， Xu， X.G.b. Basic Principles in the Radiation Dosimetry of Nuclear Medicine. Seminars in Nuclear Medicine. Volume 44， Issue 3， May 2014， 162-171
[2]Kabakchi A. M.， Havrentovaya Y.， Penkovskii V. V.， Chemical Dosimetry of Ioniszing Radiation， Kiev， ANUSSDR， 1983.
[3]Kozlov V. F.， Radiation Safety， Moscow， Energoatom Izdat， 1987.Equipment， 01/2007； 582（2）：484-488