Occupational Health Fill-in-the-Blanks 3

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41. Production and business operations entities shall establish occupational health surveillance records for workers who have labor relations with them, and maintain such records properly within the specified time frames. 42. Assuming that among a company’s 7 welders, those who are exposed to the highest concentrations of harmful substances for the longest periods of time can be identified, 3 of these workers should be selected as subjects for individual sampling. When it is not possible to determine which workers have the highest exposure concentration and longest exposure time to harmful substances, 6 operators should be selected as the sampling subjects. 43. Respiratory protection devices are classified into two types based on design: filtering and isolating. 44. To apply for Class A qualification, occupational health technology service institutions must have a registered capital of over 8 million yuan and fixed assets worth over 7 million yuan, as well as no fewer than 25 fully trained full-time technical personnel. 45. Short-term sampling refers to sampling where the sampling time is generally no more than 15 minutes; long-term sampling refers to sampling where the sampling time is generally more than 1 hour. 46. In workplaces handling highly toxic substances, red warning lines should be installed; in general toxic substance workplaces, yellow warning lines should be used. These warning lines must be placed at a distance of no less than 30 cm from the outer edge of the workplace where toxic substances are handled. 47. Health surveillance for working professionals is divided into five categories: pre-employment examinations, regular examinations during employment, examinations upon leaving the job, medical follow-ups after leaving the job, and emergency health checks. 48. For construction projects that may pose risks of occupational diseases, the project owners shall, in accordance with these regulations, apply to the work safety supervision and management department for registration, approval, review, and completion inspection regarding occupational health measures that must be implemented simultaneously with the construction process. 49. The work procedures for the pre-assessment of occupational disease hazards and the evaluation of control effectiveness mainly consist of the preparation phase, the implementation phase, and the report preparation and review phase. 50. The validity period of the Class A, Class B, and Class C qualification certificates for occupational health technology service institutions is 3 years each. If it is necessary to renew a qualification certificate after its validity period expires, the occupational health technology service agency shall submit an application to the original issuing authority 3 months prior to the expiration date. 51. For construction projects with occupational disease hazards, the project owner shall entrust a design unit with the appropriate qualifications to prepare a special design document for occupational disease prevention facilities. The design unit and the designer shall be responsible for the authenticity, legality, and practicality of the special design document on occupational disease prevention facilities prepared by them. 52. When the air temperature is below 5°C or above 35°C, and the atmospheric pressure is below 98.8 kPa or above 103.4 kPa, the volume of air collected must first be converted to a “standard sampling volume” before calculating the concentration of toxic substances in the air. 53. In workplace air, gases, vapors, and aerosols exist in three states. 54. The pump-based sampling method is divided into fixed-point sampling and individual sampling depending on the sampling approach. 55. Microporous filter membranes are preferred for collecting metallic dust, weighing filters are used for dust measurement, while glass fiber filter paper is used for capturing organic compound aerosols. 56. The impact absorption tube method involves using particles in the air sample to strike the bottom of a tube containing an absorbing solution at high speed; due to inertia, they are driven to the bottom of the tube and then washed away by the absorbing solution. Therefore, a sampling flow rate of 3 L/min must be used. 57. Methods for determining dust dispersion: filter membrane dissolution smear method, natural sedimentation method. 58. When dust is used for individual sampling, the flow rate range is 1–5 L/min; for long-term sampling, the continuous operation time should be ≥8 hours. 59. Free SiO2 refers to crystalline SiO2 (i.e., quartz); the methods for determining it include the pyrophosphate method, infrared spectrophotometry, and X-ray diffraction. 60. Fibers that meet the following criteria are counted: asbestos fibers with a length greater than 5 μm, a width less than 3 μm, and a length-to-width ratio of more than 3:1.