6 Finger Cots.

6 Foille for Burns, % oz. tubes. 1 Foille for Burns, 2-ounce bottle. 6 Gauze Roller Bandages 1" x 6 yds. 6 Gauze Roller Bandages 2'' x 6 yds. 6 Gauze Roller Bandages 3" x 6 yds. 10 Gauze Sterilized, 12" x 18".

1 Merthiolate, Tincture, 2-ounce bottle. 1 Medicine Glass.

1 Manual First Aid Instruction.

1 Scissors Pair 4" Bandage.

1 Tweezers Pair 31⁄2"

12 Safety Pins.

1 Spoon.

1 Tourniquet.

No employee shall be exposed to any of the gases, vapors, mists, dusts, or fumes on the list in section 50-204.276 which exceed the limits there stated when applied to him on an average basis for an eight hour workday, unless he is protected therefrom by respiration equipment approved for the purpose by the United States Bureau of Mines of the United States Department of the Interior and operated in accordance with the recommendations of its manufacturer. Exposures without such equipment which exceed such limits temporarily, without exceeding them on a daily average basis, or which involve more

Diborane.

dichloride)..

Dichloroethyl ether.

10 1,000

60 7,000 75

25

§ 50-204.288

VENTILATION

General ventilation and

temperature requirements.

(a) Outside air shall be provided to all workrooms at the rate of 15 cubic feet per minute per person, or one and onehalf air changes per hour, whichever is greater. In most instances, leakage through walls, doors, and windows will produce at least one and one-half air changes per hour.

(b) A minimum air temperature of 60° F. should be maintained at all workrooms where work of a strenuous nature is performed, and a minimum air temperature of 65° F. should be maintained in all other workrooms unless prohibited by process requirements.

§ 50-204.289

Local exhaust ventilation.

(a) Every local exhaust ventilation system shall produce and maintain a movement of air toward the opening, sufficient to prevent escape of contaminant to the workroom during working hours, beyond the limits shown in section 50-204.276.

(b) Air flow through branch and main ducts shall be sufficient to transport the contaminant through the system without settling.

(c) Piping shall be located so as to be accessible for inspection and maintenance.

(d) Air flow equipment including hoods, pipes, fans, motors, and collectors shall be effectively grounded.

(e) Two or more operations involving more than one substance shall not be permitted to be connected to the same exhaust system when a combination of the substances removed may constitute a fire hazard, an explosion hazard, or otherwise dangerous mixture.

(f) Those processes or operations using or generating flammable dusts, gases, fumes, vapors, mists, fibers or other impurities shall be completely protected from all sources of ignition.

(g) The capacity of an exhaust system shall be calculated on the basis of all hoods, booths, and enclosures connected to the system being open, except where the system is so interlocked that only a portion of it can be operated at a given time, in which case the capacity should

be calculated on the basis that all the hoods in the group requiring the greatest volume rate of exhaust are open.

(h) Suitable air inlets shall be provided for replacement of exhausted air.

(i) Exhaust systems handling dusts and discharging to the outer air shall be provided with suitable air-cleaning devices to remove air contaminants prior to the discharge to the outer air, except under unusual circumstances.

(j) The discharge from any exhaust system shall be such that no air contamination therefrom will enter any window, door, or other opening of any work space in quantities sufficient to create a health hazard to such space or create a nuisance to surrounding areas.

(k) Collected materials shall be removed at intervals frequent enough to insure that the exhaust system will meet the requirements of section 50-204.288 (a), at all times.

Personal protective equipment or protective shields or barriers shall be provided and maintained in usable condition whenever substances, radiation, or mechanical irritants are encountered in a manner capable of causing injury or impairment in function of any part of the body through skin or mucous membrane absorption.

BITUMINOUS Coal and LigniTE MINES § 50-204.300 Federal Mine Safety Code. The Federal Mine Safety Code for Bituminous Coal and Lignite Mines of the United States, Part I-Underground Mines, and Part II-Strip Mines, as published by the Bureau of Mines, United States Department of Interior is hereby adopted by reference as the safety and health standard required for observance in the bituminous coal and lignite mining to which section 1(e) of the WalshHealey Public Contracts Act has application.

RADIATION

§ 50-204.305 Units of ionizing radiation dose.

(a) "Dose", as used in this part, is the quantity of ionizing radiation absorbed, per unit of mass, by the body or by any portion of the body. When the regulations in this part specify a dose during a period of time, the dose means the total quantity of radiation absorbed, per unit of mass, by the body or by any portion of the body during such period of time. Several different units of dose are in current use. Definitions of units as used in this part are set forth in paragraphs (b) and (c) of this section.

(b) The rad, as used in this part, is a measure of the dose of any ionizing radiation to body tissues in terms of the energy absorbed per unit of mass of the tissue. One rad is the dose corresponding to the absorption of 100 ergs per gram of tissue. (One millirad (mrad)=0.001 rad.)

(c) The rem, as used in this part, is a measure of the dose of any ionizing radiation to body tissue in terms of its estimated biological effect relative to a dose of one roentgen (r) of X-rays. (One millirem (mrem)=0.001 rem.) The relation of the rem to other dose units depends upon the biological effect under consideration and upon the conditions of irradiation. For the purpose of the regulations in this part, any of the following is considered to be equivalent to a dose of one rem:

(1) A dose of 1 r due to X- or gamma radiation;

(2) A dose of 1 rad due to X-, gamma, or beta radiation;

(3) A dose of 0.1 rad due to neutrons or high energy protons:

(4) A dose of 0.05 rad due to particles heavier than protons and with sufficient energy to reach the lens of the eye;

(5) If it is more convenient to measure the neutron flux, or equivalent, than to determine the neutron dose in rads, as provided in subparagraph (3) of this paragraph, one rem of neutron radiation may, for purposes of the regulations in this part, be assumed to be equivalent to 14 million neutrons per square centimeter incident upon the body; or, if there exists sufficient information to estimate with reasonable accuracy the approximate distribution in energy of the neutrons, the incident number of neu

(d) For determining exposures to Xor gamma rays up to 3 Mev, the dose limits specified in § 50-204.306 may be assumed to be equivalent to the "air dose". For the purpose of this part “air dose" means that the dose is measured by a properly calibrated appropriate instrument in air at or near the body surface in the region of highest dosage rate.

[28 F.R. 8208, Aug. 9, 1963, as amended at 29 F.R. 1438, Jan. 29, 1964]

§ 50-204.306 Exposure to radiation.

(a) (1) Except as provided in paragraph (b) of this section, no employer shall possess, use, or transport radioactive material or energy in such manner as to cause any employee to receive in any period of one calendar quarter from any sources of external radiation in the employer's possession or control,' a dose in excess of the limits specified in the following table: