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Table 2 Comparison between high-energy probe and a general low-energy probe

From: Feasibility of intraoperative detection of sentinel lymph nodes with 89-zirconium-labelled nanocolloidal albumin PET-CT and a handheld high-energy gamma probe

  High-energy probe Low-energy probe Units
Source used 22Na 99mTc  
Photon energy 511 142 keV
Sensitivity 10 12 cps/kBq
Spatial resolution
 @ 1 cm in air 15 10 mm
 @ 5 cm in air 47 35 mm
Count rate range 1–50 1–100 kcps
Count rate loss < 10% < 10%  
Shielding n.a. 1 mmPb
Weight 500 650 g
  1. n.a. not available