CONTENTS PAGE SYMBOLS UNITS AND EQUIVALENTS «4 «+ «2 eo 8 e+ ef os CONTENTS 8: 8 oF oe 08 8 ce «2 o8 of 8 8 oF POTENTIAL HEALTH HAZARD -—- PERMISSIBLE LEVELS OF RADIOACTIVITY 1 2 5 LOCATION OF COLLECTING STATIONS IN NEW ZEALAND PIG. 1 ee «« 4 GRAPHICAL SUMMARY OF ROUTINE MEASUREMENTS FIG. 2 «se «ce oe 5 2 2 a 6 «+ es SUMMARY ee ee eo «2 «+ Total Beta Aotivity of Weekly Rainwater Colleotions, Table 2. Strontium-90 in Rain, Table 3a. 00. «2 Strontium-89 in Rain, Table 3b. ec, ee cs es Strontium-90 and Caesium-137 in Mille, Table 4. IIt - 16 co ee os ee «+. se co oe oe ee oe wo @ Total Beta Aotivity of Air Samples, Table 12 ~ RESULTS OF ROUTINE MONITORING OF FALLOUT DURING FIRST QUARTER 1968 10 11