SYMBOLS UNITS AND EQUIVALENTS UNITS OF RADIOACTIVITY Ch we we CUTTE nu oe ce oe te oe oe we Sef X 107° disintegrations per second mCi .. .. millicurie .. .. 107? Curies pCi .. ee picocurie .. «. 10-1% curies .. .. 2.22 disintegrations per minute UNITS OF LENGTH, AREA, VOLUME AND MASS AND THEIR EQUIVALENTS IN THE IMPERIAL SYSTEM CMje+ + oe ce en oe km... os oe ee oe es centimetre .. «2 «2 «« 0.394 inches square kilometre .. .. 0.386 square miles litre .. .. .. ee ee litre m? ae te se oe oe oe Zone ve we ce ce oe) cubic metre... oe «+ «+ 35.31 cubic feet «ee ee oe oe oe 0.880 quart BTAM oe ce oe oe op oe 0.0353 ounce NOTES 1. Unless otherwise noted, all times given in this report are New Zealand Standard time i.e. G.M.T. + 12 hours. 26 Radioactive fallout in rain is expressed as: (a) Deposition - millicuries per square kilometre (mca/xm*) (b) Concentration - picocuries per litre Concentration (pCi/litre) = Multiply mCi/km™ 3. 2 deposition (mci/xm” ) rainfall (cm) | (pci/litre) x 100 by 2.59 to obtain mCi/sq. mile. The levels of strontium-90 contamination in food and bone are given in "Strontium Units" of calcium eer ccc crcce cc ac i.e. picocuries strontium-90 per gram eee e re eceseseccecssesesss Pur Sr /g Ca. Similarly caesium-137 results are given as picocuries of caesium-137 per gram of POTASSLUM. cocecccccevesercesesessevessse pel One litre of whole milk contains approximately: 1.2 g of calciun 1.4 g¢ of potassium. TLi = 3 C3137 /g K.