Radon Graph for EML April 1994

This Graph shows what we sent to EML for the April 21, 1994 Intercomparison Exercise.
A' TESTING COMPANY INC. will report 560 ± 9 Bq/m-3 of Radon as our best estimate of the Radon concentrations in our four, 490 mL soda bottle scintillation cells that where filled by EML at 0630 EST April 18, 1994.

PRESSURE CORRECTION To determine the pressure correction for these cells, we counted each cell for 14 hours at the 760.5 mm Hg. pressure we received them using the calibration factors we established at 582.0 mm Hg. These values are expressed in pCi/L on the left side of the table below. We then briefly loosened the bottle caps of each cell to release the over pressure and normalize the cell pressure at 590.3 mm Hg. These 222Radon values are multiplied by 1.28833 to compensate for the 222Radon loss when the over pressure was released.

EML reported 570 Bq/m our 560 was 0.98 of the EML Mean