In a Laboratory Accident,a Work Area Is Contaminated with Radioactive

Multiple Choice

In a laboratory accident,a work area is contaminated with radioactive material.Health physicists monitor the area during a 30-day period and obtain the data shown in the table.The accident occurred at time t = 0 days.They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 16 counts per minute.Of the choices listed,which one is the earliest time after the accident that workers could safely return?

A) 77 days
B) 90 days
C) 102 days
D) 65 days
E) 48 days