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La. The constancy of the potassium-40 assay is indicated by the reproducibility of the results for the first 6 weeks.The peak concentrations given in Table 1 can be compared with the International Commission on Radiological Protection's maximum permissible concentration for barium-140/lanthan,um-140 in drinking water of 300 mgc/lit (3). The latter value is for continuous exposure for an indefinite period of time, while the exposure resulting from weapons testing is of short duration. Unlike strontium-90, barium-140 cannot present a cumulative hazard because of its very short half-life. Barium-140 has not been observed in any human subjects, although a search has been made for it.

No abstract

of receipt. Two sets of clinical laboratory studies were performed. These had the deuole purpose of demonstrating good health and of providing baseline values for comrir,;tive purposes. B. Group Assignments Near the end of the quarantine period, the dogs were assigned to the various treatment groups with attention to accomplishing groups balanced with respect to sex and body weight. Final assignments were as follows: Group No. Treatment Level Dog No. and Sex Male Female 1 Control 65 37 66 43 72 45 2 RDX-High 55 49 (10 mg/kg/day) 73 50 74 76 3 RDX Medium 64 40 (I mg/kg/day) 68 41 75 54 LIJ-RIONETICS Utton I A-1 *. 9 9l 9i 0i 9 o' co 0 N c c~ r* 0 c '44 0I C I.' N! C oi'i4 O rz0 0; 0; 0ý ý 9;

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