\ hee wh of 40,000 feet Alamos Scientific Laboratory has monkeys with a dose rats, mice, and 10,000 to 30,000 curles. but after Eventually, intervals, all refused to perform completely certain The experiments tasks. learned of the Los limits temporarily lost coordination and following exposure. became nauseated different Irradiated barium lanthanum source In one experiment monkeys these To determine or higher. Liles between that showed the is no There 30,000 roetgens. 10,000 and incapacitating significant change 1n the relative biological effectiveness of from 6,000 to 9,900 gamma rays when dose rates are varied roenteens per minute. (End of CONFIDENTIAL section.) DetectionandTreatmentofBrainTumors (UNCLASSIFIED) 17. Massachusetts Geneval Hospital in Boston is developing instruments and techniques to aid in the external localization of brain tumors. Radivoactive isotopes administered intravenously to animals in whitch tumors have been induced womeen trate eerous and normal tissues in varying ratios. concentration In the coincldence tumor mass enables counting with newly developed the tumor mass within the 18. the In can- A slightly higher investigators by instruments to locate 4 head. The Northwestern University Medical School in Chicago has been developing applications of possible treatment of brain tumors. tonizlng radtation in the Small pleees of gelfoam were implanted in the brain tlssues of 50 healthy adult A small zone of dead 1issue soon surrounded the site of tion. However, was replaced possible later examination disclosed by regenerating tissue. therapeutic application Implanta- that the dead The cxperiments of radioactive - oOo- cats. gold tissue suggest a or chromic Part VI eee Dat impregnated with radioactive colloidal gold cr chromic phosphate