医療用X線装置の遮蔽評価に関する新提案

概要

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The shielding of diagnostic x-rays in medical facilities is expected to be estimated according to effective dose based on the Enforcement Regulations of the Medical Service Law, which to be amended in the near future. The method of calculation provided in this paper takes account of three types of radiation, primary, scatter, and leakage, for each radiation source, to estimate effective dose in the controlled area of a medical facility. X-ray data such as transmission, kerma in air, conversion factor, scatter fraction, and half-value layer were adjusted to estimate the shielding accurately. Estimations of x-ray shielding using effective dose were performed at our existing diagnostic x-ray facility as a model for a single x-ray tube and combined radiation resulting from multiple x-ray tubes. Effective doses estimated at the border of the controlled area ranged from 0.7 to 29.2 mSv per three months, meeting the effective dose limit defined by new the regulations of 1.3 mSv per three months. Results also indicated that exposure to combined radiation can be estimated.
公益社団法人日本放射線技術学会の論文
2000-08-20