ENTRY D4215 20090826 D069D421500000001 SUBENT D4215001 20090826 D069D421500100001 BIB 9 34 D421500100002 TITLE Radioactive isotopes of the rare earths. D421500100003 I. Experimental techniques and thulium isotopes. D421500100004 AUTHOR (G.Wilkinson, H.G.Hicks) D421500100005 INSTITUTE (1USAUSA) University of California, Berkeley D421500100006 REFERENCE (J,PR,75,1370,1949) D421500100007 FACILITY (CYCLO,1USAUSA) Crocker Laboratory, 60-inch cyclotron D421500100008 SAMPLE Holmium oxide, containing D421500100009 about 15% dysprosium oxide and D421500100010 about 5% yttrium oxide. D421500100011 METHOD (ACTIV,CHSEP) D421500100012 Bombardments with 38, 30 and 20 MeV alpha-particles. D421500100013 Beam intensities were taken from the cyclotron D421500100014 instruments. D421500100015 Initially the impure oxides were bombarded and the rareD421500100016 earths separated by the column method; in subsequent D421500100017 bombardments the recovered pure rare earths were used. D421500100018 DETECTOR (GEMUC) End-on type Geiger-Muller counters D421500100019 with 3 mg/cm2 mica windows, D421500100020 filled with 10 cm argon and 0.5 cm alcohol. D421500100021 A magnetic counter was also used which enabled D421500100022 recognition of positive and negative electrons and D421500100023 provided a check on data obtained from absorption D421500100024 measurements. D421500100025 In gamma-ray absorptions, lead screens up to 45 g/cm2 D421500100026 were used with a beryllium absorber, sufficient to D421500100027 remove all secondary electrons, placed directly below D421500100028 the counter window. Measurements were taken on a D421500100029 counter tube without the usual lead housing, as D421500100030 scattering in the latter has been found to give high D421500100031 values for the absorption half-thickness of hard D421500100032 gamma-radiation. D421500100033 The counter geometries were calibrated by use of a D421500100034 weighed uranium (UX2) standard. D421500100035 HISTORY (20090826C) KB D421500100036 ENDBIB 34 0 D421500100037 NOCOMMON 0 0 D421500100038 ENDSUBENT 37 0 D421500199999 SUBENT D4215002 20090826 D069D421500200001 BIB 3 3 D421500200002 REACTION (67-HO-165(A,3N)69-TM-166,,SIG) D421500200003 DECAY-DATA (69-TM-166,7.7HR,XR) D421500200004 STATUS (TABLE) Data were taken from Table 2 of the Ref. D421500200005 ENDBIB 3 0 D421500200006 NOCOMMON 0 0 D421500200007 DATA 2 2 D421500200008 EN DATA D421500200009 MEV B D421500200010 38. 1.1 D421500200011 30. 0.0005 D421500200012 ENDDATA 4 0 D421500200013 ENDSUBENT 12 0 D421500299999 SUBENT D4215003 20090826 D069D421500300001 BIB 3 3 D421500300002 REACTION (67-HO-165(A,2N)69-TM-167,,SIG) D421500300003 DECAY-DATA (69-TM-167,9.6D,XR) D421500300004 STATUS (TABLE) Data were taken from Table 2 of the Ref. D421500300005 ENDBIB 3 0 D421500300006 NOCOMMON 0 0 D421500300007 DATA 2 3 D421500300008 EN DATA D421500300009 MEV B D421500300010 38. 0.007 D421500300011 30. 0.1 D421500300012 19. 0.001 D421500300013 ENDDATA 5 0 D421500300014 ENDSUBENT 13 0 D421500399999 SUBENT D4215004 20090826 D069D421500400001 BIB 3 3 D421500400002 REACTION (67-HO-165(A,N)69-TM-168,,SIG) D421500400003 DECAY-DATA (69-TM-168,85.D,XR) D421500400004 STATUS (TABLE) Data were taken from Table 2 of the Ref. D421500400005 ENDBIB 3 0 D421500400006 NOCOMMON 0 0 D421500400007 DATA 2 3 D421500400008 EN DATA D421500400009 MEV B D421500400010 38. 0.0001 D421500400011 30. 0.003 D421500400012 19. 0.2 D421500400013 ENDDATA 5 0 D421500400014 ENDSUBENT 13 0 D421500499999 ENDENTRY 4 0 D421599999999