=+3.64 ● Americium 241 ( 241Am) is a radioactive material used in the manufacture of smoke detectors. The article

“Retention and Dosimetry of Injected 241Am in Beagles”

(Radiation Research [1984]: 564–575) described a study in which 55 beagles were injected with a dose of 241Am

(proportional to each animal’s weight). Skeletal retention of 241Am (in microcuries per kilogram) was recorded for each beagle, resulting in the following data:

0.196 0.451 0.498 0.411 0.324 0.190 0.489 0.300 0.346 0.448 0.188 0.399 0.305 0.304 0.287 0.243 0.334 0.299 0.292 0.419 0.236 0.315 0.447 0.585 0.291 0.186 0.393 0.419 0.335 0.332 0.292 0.375 0.349 0.324 0.301 0.333 0.408 0.399 0.303 0.318 0.468 0.441 0.306 0.367 0.345 0.428 0.345 0.412 0.337 0.353 0.357 0.320 0.354 0.361 0.329