Dose measurements of x-ray radiation from JIPP T-II device in the vicinity of Water Research Institute, Nagoya University

Spatial distribution of X-ray doses from JIPP T-II, a hybrid device of tokamak and stellarator at the Institute of Plasma Physics, has been measured with thermoluminescence dosimeter (TLD). The increment in the dose, to which JIPP T-II is responsible, is discriminating from natural doses only at non-shielded regions of the Water Research Institute (WRI) which is located 36 m apart from JIPP T-II device. By controlling the operation of JIPP T-II, an intergrated value of the increment measured with ionization chamber at the windowside of the second floor, WRI, has been kept below 100 μrem during a week, according to the regulation of Nagoya University. The doses at the non-shielded region of WRI are expected to decrease to one-fifth of the present value with a shield (20 mm thick lead panels) which will be completed by the end of February 1981. (author)