| ZHANG Peng,ZHANG Jie,WAN Ling,et al.Safety evaluation in vicinity during and after 125I seeds implantation in head and neck region[J].Chinese Journal of Radiological Medicine and Protection,2010,30(2):209-212 |
| Safety evaluation in vicinity during and after 125I seeds implantation in head and neck region |
| Received:October 08, 2009 |
| DOI： |
| KeyWords:125I-seeds Radiation dose Radiation protection Head and neck tumor |
| FundProject:首都医学发展科研基金(2005-2006) |
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| Abstract:: |
| Objective To measure the radiation dose during and after 125I seeds implantation in head and neck region,and to evaluate the radiation safety in the vicinity.Methods Forty patients who had 125I seeds implanted in head and neck region were divided into two groups as facial and neck group as well as intra-oral group. The radiation doses were measured at the distance of 30 cm in three different directions during operation and at the distances of 30, 50, and 100 cm after operation when the patients opened and closed their mouth, respectively. Results The radiation dose rate on the treatment side ［(2.60±0.37) μSv］ was higher than that on the other two sides ［(0.28±0.05) and (0.15±0.03) μSv］ during the operation, with the statistical difference (t=25.62, 29.51, P< 0.05). In the intra-oral group, the radiation dose rates at the distances of 30 and 50 cm were higher when the patients opened their mouths ［(21.71±0.92) and (9.50±0.38) μSv/h］ than those when they closed their mouths ［(9.29±1.14) and (4.61±1.61) μSv/h］, with the statistical difference (t=35.87, 13.70, P＜0.05), but without statistical difference at the distance of 100 cm distance ［(1.54±0.05) and (1.34±0.45) μSv］(t=1.94, P >0.05).On the treated side at all the distances of 30,50, and 100 cm, the radiation dose rates were higher in the facial and neck group ［(66.28±3.31), (35.06±3.05) and (1.72±0.17) μSv/h］ than those in the intra-oral group ［(52.46±3.54), (20.78±2.01) and (1.55±0.13) μSv/h］, with the statistical difference (t=12.74, 15.51,3.69, P< 0.05). At the distance of 100 cm, the radiation dose rates were (1.72±0.17) μSv/h in facial and neck group, (1.55±0.13) μSv/h when they opened their mouth and (1.18±0.42) μSv/h when they closed their mouth in the intra-oral group, which was safe for the public.Conclusions Radiation exposure to the medical workers and the public from the patients is very low. It is easy to achieve the radiation safety by reducing the exposure time, increasing the distance and changing the exposure direction. |
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