Objective:We studied the relationship between impact of dose distribution and energy of radioactive ray in teletherapy with contraceptive ring.Methods:The SI Virtual Water Phantom was used to monitor medium of dose.PTW ionization chamber was used to detect the dose.AP-PA(10 cm × 10 cm) and SAD technique were adopted.Monitoring dose of different locations with different energy of radioactive ray in AP and PA respectively with and without contraceptive ring,repeated 5 times.Results:Dose of with contraceptive ring was lower than that of without contraceptive ring in AP 6 MV-X-ray(P 0.05).Dose of except for the center was higher than that of without contraceptive ring in AP and PA 15 MV-X-ray(P 0.05).In AP and PA 15 MV-X-ray,doses of the upper,the left and right was higher than that of the center(P < 0.05).Conclusion:Metallic contraceptive ring would effect the dose distribution of radioactive ray,but influence degree related to locations of contraceptive ring and energy of radioactive ray.
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