ENTRY C2836 20221021 C224C2836000 1 SUBENT C2836001 20221021 C224C2836001 1 BIB 11 44 C2836001 2 TITLE Cyclotron Targets: Preparation and Radiochemical C2836001 3 Separation. III. Na22 C2836001 4 AUTHOR (J.W.Irvine Jr,E.T.Clarke) C2836001 5 REFERENCE (J,JCP,16,686,1948) C2836001 6 #doi:10.1063/1.1746975 C2836001 7 INSTITUTE (1USAMIT) C2836001 8 FACILITY (CYCLO,1USAMIT) C2836001 9 DETECTOR (PROPC) Gamma-ray activities from the Na24 generated C2836001 10 in the individual foils were measured on a calibrated C2836001 11 platinum screen wall counter shielded with 1/16" lead, C2836001 12 and compared with a 10-microgram radium standard to C2836001 13 obtain the absolute disintegration rates. Decays of C2836001 14 several foils were also followed for a few days as a C2836001 15 check on the identity of the activity. The Na22 C2836001 16 positrons in the foils were measured with a bell-type C2836001 17 thin window counter after the shorter-lived component C2836001 18 had died away. C2836001 19 SAMPLE The magnesium disks, because of their fragility, were C2836001 20 sealed between layers of aluminum foil (0.00025") and C2836001 21 stacked, resulting in a series of 24 absorbers whose C2836001 22 average individual thickness was 7.7 mg/cm2 and whose C2836001 23 total thickness, 185 mg/cm2, was approximately equal toC2836001 24 the distance of penetration of the 14-MeV deuterons C2836001 25 used. C2836001 26 METHOD (CHSEP,STTA,ACTIV) The stack of foils was bombarded C2836001 27 for 1.5 hours, 47.5-microampere minutes, with a C2836001 28 deuteron beam whose initial energy was 14.20 MeV C2836001 29 (range 184.5 mg/cm2 Al). After bombardment the C2836001 30 targets should be allowed to age for about a week to C2836001 31 allow the Na24 to decay, thus reducing the radiation C2836001 32 hazard. The aged target is weighed and dissolved in C2836001 33 50 percent excess of glacial acetic acid. With the C2836001 34 metal the reaction is slow in starting but becomes C2836001 35 very vigorous as it proceeds. After the reaction C2836001 36 subsides, the solution is diluted with an equal C2836001 37 volume of 50 percent alcohol. The last traces of C2836001 38 metal are dissolved after 15-30 minutes. If any C2836001 39 insoluble residue remains, it is removed by filtration.C2836001 40 ERR-ANALYS (ERR-1) Even though individual thicknesses C2836001 41 varied as much as 20 percent, the data could be C2836001 42 corrected for these variations to reduce errors from C2836001 43 this source to about 2 percent. C2836001 44 CORRECTION Target thickness corrections. C2836001 45 HISTORY (20221021C) BP C2836001 46 ENDBIB 44 0 C2836001 47 COMMON 1 3 C2836001 48 ERR-1 C2836001 49 PER-CENT C2836001 50 2.0 C2836001 51 ENDCOMMON 3 0 C2836001 52 ENDSUBENT 51 0 C283600199999 SUBENT C2836002 20221021 C224C2836002 1 BIB 3 3 C2836002 2 REACTION (12-MG-24(D,A)11-NA-22,,SIG) C2836002 3 DECAY-DATA (11-NA-22,3.0YR) C2836002 4 STATUS (CURVE) Fig. 1, page 688 of J,JCP,16,686,1948. C2836002 5 ENDBIB 3 0 C2836002 6 NOCOMMON 0 0 C2836002 7 DATA 2 23 C2836002 8 EN DATA C2836002 9 MEV B C2836002 10 2.601 0.005 C2836002 11 3.582 0.021 C2836002 12 4.415 0.048 C2836002 13 5.162 0.074 C2836002 14 5.845 0.102 C2836002 15 6.506 0.122 C2836002 16 7.061 0.134 C2836002 17 7.659 0.146 C2836002 18 8.192 0.148 C2836002 19 8.704 0.151 C2836002 20 9.238 0.157 C2836002 21 9.665 0.160 C2836002 22 10.134 0.156 C2836002 23 10.518 0.150 C2836002 24 10.988 0.145 C2836002 25 11.415 0.140 C2836002 26 11.820 0.133 C2836002 27 12.204 0.131 C2836002 28 12.610 0.126 C2836002 29 12.973 0.119 C2836002 30 13.314 0.111 C2836002 31 13.698 0.106 C2836002 32 14.040 0.100 C2836002 33 ENDDATA 25 0 C2836002 34 ENDSUBENT 33 0 C283600299999 SUBENT C2836003 20221021 C224C2836003 1 BIB 4 4 C2836003 2 REACTION (12-MG-26(D,A)11-NA-24,,SIG) C2836003 3 REL-REF (A,C2841002,M.C.Henderson,J,PR,48,855,1935) C2836003 4 DECAY-DATA (11-NA-24,14.8HR) C2836003 5 STATUS (CURVE) Fig. 1, page 688 of J,JCP,16,686,1948. C2836003 6 ENDBIB 4 0 C2836003 7 NOCOMMON 0 0 C2836003 8 DATA 2 23 C2836003 9 EN DATA C2836003 10 MEV B C2836003 11 2.579 0.005 C2836003 12 3.582 0.021 C2836003 13 4.415 0.039 C2836003 14 5.119 0.054 C2836003 15 5.887 0.070 C2836003 16 6.527 0.079 C2836003 17 7.104 0.082 C2836003 18 7.701 0.090 C2836003 19 8.213 0.096 C2836003 20 8.726 0.093 C2836003 21 9.216 0.093 C2836003 22 9.686 0.092 C2836003 23 10.155 0.087 C2836003 24 10.518 0.084 C2836003 25 11.009 0.079 C2836003 26 11.436 0.077 C2836003 27 11.863 0.070 C2836003 28 12.226 0.068 C2836003 29 12.610 0.064 C2836003 30 12.994 0.064 C2836003 31 13.335 0.060 C2836003 32 13.698 0.054 C2836003 33 14.040 0.052 C2836003 34 ENDDATA 25 0 C2836003 35 ENDSUBENT 34 0 C283600399999 ENDENTRY 3 0 C283699999999