## Industrial Hygiene and Toxicology Calculations

Solve the IH Calculation problems in the document and show your work. You may use the equation editor in Microsoft Word® or work out the problems by hand. You may scan or take pictures of your hand-written work with a mobile device or digital camera and then upload the file. If you have multiple images or scanned pages, please consolidate them into one file, along with the solutions to the assigned problems. For example, you could insert multiple images into your answer document and submit the one document file. All questions must be clearly numbered, and all work must be legible.

# Industrial Hygiene and Toxicology Calculations

Name:  ________________________________________________________________

1. If the air in a 12-in diameter duct with an air flow of 1,500 ft3/min and a velocity of 14 ft/min flows into a 6-in diameter duct, what are the new flow rate and velocity? Show all work. (20 pts)
• If an employee is exposed to continuous sound levels for 2 hours at 95 dB and is then exposed to sound levels below 65 dB for the rest of the 8 hour day, what is the employee’s 8 hour TWA in dBA using OSHA’s calculations? Does this employee exceed OSHA’s PEL? Does this employee need to be in a hearing conservation program? Show all work. (20 pts)
• Complete the following table with the appropriate molecular weights for each chemical and convert the following concentrations from parts per million (ppm) to milligrams per meter3 (mg/m3) or from mg/m3 to ppm. Show all work. (20 pts)
• An employee needs to lose 724 BTU/hr through evaporation in order to maintain a body temperature of 98.6 °F. The outdoor air temperature is 84 °F and the water vapor pressure is 35 mm Hg with a wind speed of 12mph.  What is the heat stress index? Show all work. (20 pts)
• The exposure rate 5ft from a certain gamma-ray source is 200 mR/h. At what distance from the source does the exposure rate fall to 2 mR/h? Show all work. (20 pts)

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