Types of Surveys

Meter surveys, using Geiger detectors or scintillation probes, can identify gross contamination (total contamination consisting of both fixed and removable contamination) but will detect only certain radioisotopes.

Wipe surveys, using “wipes” counted on a liquid scintillation counter or a gamma counter, can identify removable contamination only but will detect most radioisotopes used at Princeton. Wipe tests are the most versatile and most sensitive method of detecting low-level contamination in the laboratory.

The Ludlum Model 14C survey meter was designed to meet nuclear medicine requirements. The Model 14C is similar to the Model 3, but with an internal energy compensated G-M detector. It can be used with one or more external GM or scintillation detectors for alpha, beta, or gamma detection up to 0-200 mR/hr.  This additional internal detector creates fifth high range of 0-2000 mR/hr in addition to the four ranges covered by the external probe.  It is used in hosptials, universities, power plants and regulatory facilities. Standard scale is 0-2 mR/hr with five counting ranges: x0.1, x1, x10, x100, and x1000. (Dual scale cpm & mR/hr are available on request). Two “D” cells provide over 200 hours of operation. The Model 14C is supplied as shown with built-in speaker. 

https://www.drct.com/dss/INSTRUMENTATION/Ludlum/Ludlum-Model-14c.htm

You may also consider the FLUKE 451P. I have never tested for nuclear medicine purpose, but it is a very reliable and precise tool for monitoring a wide spectrum of X ray, up to rates very close to ground level.

http://www.flukebiomedical.com/biomedical/usen/radiation-safety/survey-meters/451p-radiation-detector-ion-chamber-survey-meter.htm?pid=54793