Working Environment Measurement Standards
Ministry of Labour Notification No. 46 of April 22, 1976
Latest Amendments:
Ministry of Health, Labour and Welfare Notification No. 191 of April 27, 2001
作業環境測定基準：原文
Article 9.The measurement of concentration of radioactive substances in the air at a workplace listed in item 2 (working rooms for handling radioactive substances) or 3 (work to mine and collect nuclear raw materials in a pit), Article 53 of Ordinance on Prevention of Ionizing Radiation hazards shall be made by the following methods:
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- According to the condition of radioactive substances shown in the left column of the following table, one of the sampling methods listed in the right column of the table shall be used:
- Condition of radioactive substance
- Specimen collection method
- Particulates
- Liquid absorption or filtration sampling method
- Gases
- Liquid absorption, solid adsorption, direct or cooling condensation sampling method
- One of following analytical methods shall be used:
- The analytical methods are as follows: (when it is obvious that there is no radioactive substance emitting α-rays, or the concentration of the radioactive substance is obvious by the measurement of ionizing radiation other than α-rays, the analysis by method 1) may be omitted, and when it is obvious that there is no radioactive substance emitting β-rays, or the concentration of the radioactive substance is made clear by the measurement of ionizing radiation other than β-rays, the analysis by method 2) may be omitted, and when it is obvious that there is no radioactive substance emitting γ-rays, or the concentration of the radioactive substance is made clearly by the measurement of ionizing radiation other than γ-rays, the analysis of method 3) may be omitted respectively.)
- Total α-radioactivity measuring method or α-ray spectrometric analysis
- Total β-radioactivity measuring method or β-ray spectrometric analysis
- Total γ-radioactivity measuring method or γ-ray spectrometric analysis
- Radiochemical analysis
- Fluorophotometric analysis when the concentration of uranium in the air is measured .
- The analytical methods are as follows: (when it is obvious that there is no radioactive substance emitting α-rays, or the concentration of the radioactive substance is obvious by the measurement of ionizing radiation other than α-rays, the analysis by method 1) may be omitted, and when it is obvious that there is no radioactive substance emitting β-rays, or the concentration of the radioactive substance is made clear by the measurement of ionizing radiation other than β-rays, the analysis by method 2) may be omitted, and when it is obvious that there is no radioactive substance emitting γ-rays, or the concentration of the radioactive substance is made clearly by the measurement of ionizing radiation other than γ-rays, the analysis of method 3) may be omitted respectively.)
- According to the condition of radioactive substances shown in the left column of the following table, one of the sampling methods listed in the right column of the table shall be used:
- Notwithstanding the provision set forth in the preceding paragraph, the measurement of concentration of gaseous radioactive substances in the air may be made by the direct indication method.
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