Page 403 - Emergency Response Book

Example Calculation 2 13

A source is producing an intensity of 456 R/h at one foot from the source. What would be the

distance in feet to the 100, 5, and 2 mR/h boundaries.

Convert R/hour to mR/hour

456R/h x 1000 = 456,000 mR/h

Rework the equation to solve for D 2

Plug in the known values and solve

D = 67.5 feet
2

Using this equation the 100mR/h boundary would be at 68 feet, the 5mR/h boundary would be

at 301.99 feet, and the 2mR/h boundary would be at 477.5 feet.

Sources are seldom operated for an entire hour, and collimators are often used which reduce

these distances considerably.

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