Chapter VII. Working Environment Measurement
(Workshops Where the Working Environment Measurement Shall
Article 53. The workshops as established by the Ministry of Health, Labour and Welfare Ordinance based on the item 6 of Article 21 of the Cabinet Order are as given below:
(1) The portion which corresponds to the controlled area of
workshops therein to carry out the radiation work.
(2) Work rooms for handling radioactive
(3) Workshops therein to carry out work as listed in item 7 of Attached
Table 2 of the Cabinet Order.
(Measurement, etc., of Dose Equivalent Rate)
Article 54. The employer shall periodically measure the dose equivalent rate
or dose equivalent due to the external radiation in the controlled area
designated in item 1 of the preceding article by using radiation measuring
instrument at least monthly (at least in every 6 months where the stationary
radiation equipment is provided with the fixed shield or where the radiation
equipment is loaded with the radioactive substance of less than 3.7 GBq)
and record the following matters for each measurement and file for at least
(1) Time and date of measurement.
(2) Method of measurement.
(3) Kind, type and performance of radiation measuring instrument.
(4) Measured parts.
(5) Conditions of measurement.
(6) Result of measurement.
(7) Name of measurer.
(8) Outline of the measures taken according to the result
of the measurement.
2. Notwithstanding the provision of the preceding
paragraph, the dose equivalent rate and dose equivalent set forth in the
preceding paragraph may be determined by calculation where measurement by the
measuring instrument is extremely difficult.
3. The measurements specified in paragraph 1 or
the calculations specified in the preceding paragraph shall be made for a 1-cm
dose equivalent rate or 1-cm dose equivalent. However, in places where a
70-micrometer dose equivalent rate may exceed 10 times the 1-cm dose equivalent
rate, or a 70-micrometer dose equivalent may exceed 10 times the 1-cm dose
equivalent among the controlled areas prescribed in item 1 of the preceding
article, the same shall be made for the 70-micrometer dose equivalent rate or
the 70-micrometer dose equivalent as well.
4. The employer shall inform workers who enter the
controlled area of the result of the measurement provided for in paragraph 1 or
the result of calculation provided for in paragraph 2 by posting it, etc., in an
easily visible location.
(Measurement of Concentrations of Radioactive
Article 55. In terms of the workshops as provided for by item 2 or 3 of Article 53, the employer shall make measurements of contaminations of radioactive
substances in the air periodically, once at an interval which is shorter
than a month by radiation measuring instruments, and shall make records
on the matters as given in the respective items of paragraph 1 of the preceding
Article and keep the records in custody for a period of five years.