af wr e vege rand oe TF 2 alen “oy er we n he ~. “ i »- A a. - ~ Tt . em 2 LeT a ” 2 REE ee oo Sp eae, ee de a mw FT > ag ire | ~~ Ae. , 4 oe. . £ ; ind beatae veh «coinanionBed ‘d Fig. B. 46,1. d. “The gammay backgroundexposure rate ° URfin) at 1m above the ground, measured with a portable Nal scintillation counter, age,

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