the monitoring time interval. For example, a decay rate determined from monitoring readings taken

between H + 4 and H + 8 can be used to determine dose rates at H + 8 and on up to H + 20 (TP = H + 8

+ 3(8-4) = H = 20).

initiated at H + 4 and expected to be completed by H + 6; the target time for preparation of the pattern is

H + 8. By H + 4 to H + 6, a decay estimation can be made and used to process the remainder of the

dose-rate information from the collection effort. This procedure will result in a reasonably reliable H +

1 pattern. By H + 6, a decay-rate determination can be accomplished which will allow use of the

resulting pattern until about H + 12. By H + 12, a decay-rate determination can be accomplished which

will allow use of the pattern until H + 36 hours.

log-log graph paper, the decay rate of the contamination will cause the line plotted to be a straight line,

inclined at a slope (n) to the axes of the graph.

determination; H-hour is known or determined to be 0930 hours.

These data are plotted on log-log graph paper, using the time as the number of hours past H-hour and the

best possible set of three lines is drawn through the points. When these plots are made, the graph shown

in *figure 9 *on page 38 is obtained. The slope of the three parallel lines is n, the decay exponent.

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