Table 5.

Comparison between ¹⁷⁷Lu, ⁶⁷Cu, ⁴⁷Sc, and ¹⁶¹Tb: Energy released as Auger and conversion electrons per decay (keV) and its distribution within specific energy ranges. The linear energy transfer (LET) for each energy category is also shown.

Energy range (keV)	LET § (keV/µm)	177Lu	67Cu	47Sc	161Tb
0.1 - 1	19.23 - 9.51	0.11	0.2	~ 0	1.3
1 - 10	9.51 - 2.26	0.89	0.55	0.01	7.7
10 - 50	2.26 - 0.66	2.6	-	-	37.5
50 - 200	0.66 - 0.28	11	13.7	0.48	1.6
Total energy per decay from Auger and conversion electrons (keV)		14.7	14.5	0.5	48.2

§ LET values for electrons ≥10 keV are taken from the database ESTAR ⁴⁶; the other LET values are from Champion ³³. The highest LET value is for electrons whose energy is close to 0.15 keV.