Radiographic calculation

[jhun guarico]

Our source is iradium 192 what is the calculation or formula for the safe distance for unshielded source ?

[jhun guarico]

Our source is iradium 192 what is the safe distance for unshielded source , any formula or calculation

[daveb]

You can use the specific gamma constant, which is only good for point sources or for distances far from distributed sources. The gamma constant for Ir-192 is 4.8 R-cm^2/hr mCi, and the formula is Exposure rate = Gamma*Activity/distance^2.

[seycyrus]

I'm curious, don't you have health physicists with spreadsheets to give you those numbers?