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　　solid water phantomMainly used for dose measurement and equipment calibration in medical radiation therapy:
 

　　-Material composition and properties: Usually made of special materials that are very similar in chemical and physical properties to real biological tissues, especially equivalent to water. This equivalence allows the solid water phantom to accurately simulate the biological environment and thereby replace real biological tissue for dose measurement and equipment calibration in radiotherapy.
 

　　-Structural design: usually in a sheet-like structure, with a variety of standard sheet thicknesses to choose from to adapt to different use needs. In addition, the interior of the phantom may contain cavity designs that can accommodate parallel plate ionization chambers or finger-shaped ionization chambers, making the measurement process more flexible and accurate.
 

　　- Working principle: During radiotherapy, in the radiation field of radiotherapy equipment, to simulate the dose distribution received by the patient during actual treatment. Equivalent to biological tissue, it can accurately reflect the absorption and scattering of rays in biological tissue, thereby helping radiation therapists ensure that patients receive accurate doses.
 

　　solid water phantomPrecautions for use:
 

　　1. Avoid collisions and extrusions: Although it has a certain strength, collisions and extrusions must be avoided during use and storage to avoid damage or deformation of the phantom and affect the accuracy of measurement results.
 

　　2. Keep it clean: Before use, make sure the surface is clean and free of dust, impurities, etc. If there are stains on the surface of the phantom, wipe it gently with a clean soft cloth. Avoid using organic solvents or other corrosive substances to avoid damaging the phantom.
 

　　3. Prevent moisture: Although it has a certain resistance to humidity, being in a humid environment for a long time may still affect its performance. Therefore, the environment should be kept dry during storage to prevent the phantom from getting damp.
 

　　4. Regular calibration: During use, its performance may change, so it needs to be calibrated regularly. During calibration, standard dosimeters and measurement methods should be used to compare the measurement results with the standard values. If there is any deviation, the phantom should be adjusted or replaced in time.
 

　　5. Install the dosimeter correctly: When installing the dosimeter into the cavity, ensure that the installation position is accurate and firm to avoid the dosimeter from moving or shaking during the measurement process, which will affect the accuracy of the measurement results.
 

　　6. Pay attention to radiation safety: When performing exposure measurements, you must strictly abide by radiation safety operating procedures, wear personal dosimeters, protective clothing and other protective equipment to avoid unnecessary radiation exposure. At the same time, operations must be carried out within specific radiation areas and warning signs must be set to prevent others from entering accidentally.