TY - RPRT TI - A Low Level Radioactivity Monitor for Aqueous Waste AB - A system is described for continuous monitoring of very low levels of radioactivity in waste water containing typically 3.5 g/l dissolved solids. Spray evaporation of the water enables the dissolved solids to be recovered in the form of an aerosol and collected on a filter tape where the radioactivity is measured by a radiation detector. The advantage of this method compared with a direct measurement is that the attenuating effect of the water is removed and thus greater sensitivity is obtained. Compensation for background and any contamination is achieved by feeding distilled water to the aerosol generator every alternate sampling period and recording the count difference between two successive sampling periods . A printed record of the totalised count difference is obtained once per hour during the integration time of one month. For {beta} radioactivity the minimum values of specific activity measurable extend from 1 x 10{sup -6} Ci/m{sup 3} to 6 x 10{sup -8} Ci/m depending on the B end-point energy in the range 167 KeV to 2.26 MeV. The estimated minimum measurable specific activity is 6 x 10{sup -8} Ci/m{sup 3}. AU - "Quirk, E J.M." KW - "61 RADIATION PROTECTION AND DOSIMETRY" KW - "RADIATION MONITORING" KW - "LIQUID WASTES" KW - "LOW-LEVEL RADIOACTIVE WASTES" KW - "WASTE WATER" KW - "EVAPORATION" KW - "SENSITIVITY" KW - "SAMPLING" DO - https://doi.org/ UR - https://www.osti.gov/etdeweb/servlets/purl/20956279 PB - CY - Sweden PY - 1968 DA - 1968-04-15 LA - English J2 - [] VL - C1 - AB Atomenergi, Nykoeping (Sweden) C2 - C3 - AE-317 C4 - C5 - Commercial reproduction prohibited; OSTI as DE20956279 L3 - Other Information: 4 refs., 11 figs., 3 tabs. ER -