ABSTRACT

The uncertainty (U) must be converted from cpm to Bq mL−1 by dividing by (EFF × V × K). See Sections 11.2 and 11.3.

11.5 The concentration of tritium oxide in air is calculated as follows using silica gel with 100% collection efciency:

C

C W V TA

= ×× , (3)

where CA is the concentration of tritium oxide in air in Bq cm−3, W is the total volume of water collected (mL), VR is the mean air sampling ow rate (cm3 min−1), and T is the air-sampling time (min).