QUESTION 2

1. Your quality control/quality assurance manager has requested your assistance in the testing and

repair facility. One of the test procedures utilizes a radiation source that is emitting gamma

radiation at a rate of 50 mrem/hour at a distance of 1 foot. This testing is done for approximately 2

hours per day, 2 days per week. The Occupational Safety and Health Administration (OSHA) has

a PEL of 1.25 rem per quarter and 5 rem per year.

a. Determine the employee's exposure for 1 year.

b. Calculate the exposure rate if the employee was moved to a distance of 3 feet from the

radiation source.

c.

Calculate the exposure rate of the employee if a 5 cm lead shield was installed between

the source and the detector. The employee is working at a distance of 1 foot from the

source. [u for lead, (662 keV gamma ray) = 1.23cm-¹]