155Tb production by cyclotrons: what level of 155Gd enrichment allows clinical applications?

EJNMMI Physics

Table 3 Number of nuclear transitions (MBq × h/MBq) in source organs per unit administered activity of ^xxxTb-cm09 for male ICRP 89 human phantom

Organ/tissue	^154gTb-cm09	¹⁵⁵Tb-cm09	^156gTb-cm09	^156m1Tb-cm09	^156m2Tb-cm09
Heart contents	0.118	0.168	0.168	0.122	0.075
Lung	0.177	0.391	0.392	0.190	0.079
Spleen	0.014	0.048	0.048	0.016	0.005
Kidneys	0.912	2.885	2.891	1.012	0.244
Stomach	0.020	0.043	0.044	0.022	0.008
Left colon	0.0031	0.0072	0.0072	0.0033	0.0014
Small intestine	0.0146	0.0335	0.0335	0.0156	0.0066
Right colon	0.0062	0.0144	0.0144	0.0067	0.0028
Rectum	0.0031	0.0072	0.0072	0.0033	0.0014
Liver	0.498	1.443	1.446	0.545	0.166
Cortical bone	0.405	0.991	0.993	0.438	0.152
Salivary glands	0.041	0.112	0.113	0.044	0.014
Remaining	3.985	8.819	8.833	4.274	1.719