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FOR HUMAN SAFETY. Aboard the APH-II2 

 "Haven" Col. Stafford L.Warren of Rochester, New 

 York, radiological safety adviser to Joint Task 

 Force One, explains the operation of a Geiger 

 counter to Captain A. C. Thorington, skipper of 

 the "Haven." It was Col. Warren's responsibility to 

 see that no man of the 42,000-man Task Force re- 

 ceived injury from radioactivity produced by the 

 bombs. Specially-selected technicians were assem- 

 bled and trained in radiological safety monitoring. 

 In appraising radioactivity, they made extensive 

 use of Geiger counters. These consisted of gas- 

 filled tubes each containing two electrodes, one 



of them at high electrical potential. When placed 

 in the vicinity of a radioactive substance, whether 

 it be radium in a research laboratory, samples of 

 radioactively-contaminated Bikini Lagoon water, 

 or the deck of a "hot" ship, a Geiger counter be- 

 comes intermittently conducting, transmitting tiny 

 pulses of current. When amplified, these pulses 

 produce a crackling noise in headphones. They 

 may also be "counted" in terms of current passing 

 through an ordinary ammeter. OPPOSITE. Sam- 

 ples of Lagoon water are taken using a Nansen 

 bottle. Analysis of sea water was important scien- 

 tifically and as a matter of safety. 



