The thermal neutron, epithermal neutron and high-energy photon fluence were measured in this work around the Varian 21EX 23 MV CLINAC, which is operated in Albairouni hospital in Damascus, Syria. Background: Photoneutron measurements around medical CLINAC aim to protect both patients and staff from unwanted radiation. Materials and methods: Neutron and photon activation techniques were applied using gold foils. Results: It was found that high-energy photons fluence has practically a constant value in the field size. The thermal and epithermal neutron fluence along ox and oy axes has the same order of magnitude. Conclusion: Gold foils have been used successfully to measure neutron flux and high-energy photons simultaneously using activation techniques.
Patients treated with high doses of I for thyroid cancer are generally hospitalised under isolation conditions for up to several days after treatment. The external dose rates from 192 randomised samples of thyroid carcinoma patients were measured at 1 m after 48 h of radioiodine dose administration. The results showed that 12 % of released patients had an external dose rate of>30 µSv h (the release criterion set by the national regulations) whereas 42 % of them had an external dose rates between 11 and 20 µSv h Ninety-two per cent of the patients were released after 48 h. The patient socio-economical conditions were taken into consideration to investigate unnecessary public exposure; only 36 % of the patients had one adult person living with them and 48 % of patients had no children. In addition, 68 % of patients declared that they use the public transport after discharge from hospital. The applied release criteria was successfully respected with a compliance ratio of 90 %, and it was adequate to maintain a suitable level of public radiation protection.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.