co CHAPTER 17 where 4 =» dose rate from deposited activity at time t s Aot7? 2, where t7i-2 results from the assumed radioactive- decay law. do = dose rate” corrected for decay to reference time of 1 hr = Ofort < t, = amex) for t> ty = aime )iy ty for ty § t Sty ts ty max al ) is the experimentally determined or calculated maximm dose rate (c orrected to 1 hr). Usually it will be equal to ) asD) oa (te )t, (- 1.2 and is a function of position in the fallout fleld. When calculated by the D-Model it is the summation of dose rates contributed by each disc landing at a given point, each corrected back to 1 hr from ite actual time of arrival. te ™ time of final arrival of activity. Then, (max ) 1.25 do ty 0.2 t lisit 0.2 +h] for tre ts te (17.25) ty . end D sam? 1 .[tr| 0-2] = Ee € for t> ty (17-26) The estimated maximum dose rate qimex) at a given time ¢ is fairly sensitive to the shape of the curve describing the buildup of d vith *The symbol d, used in this section has no relationship whatever to the do used in Secs. 17.5.5 and 17.6.5, It is unfortunate that the references cited use the same symbols for different concepts, but in the present work it has been decided not to add to the possibility of confusion by increasing the total number of symbols. “BEST AVAILAGLE COPY 17-79 sre We =rem ee ew ee ee ee eee ee ee ae ee eee