Ludlum - 3-97 NORM Meter

The 3-97 NORM meter, the classic NORM measuring tool Customized for simple and effective NORM detection

The Ludlum 3-97 NORM meter is excellent for measuring NORM in all kinds of processing facilities. This instrument is highly sensitive to Alpha, Beta and Gamma radiations. It has been modified for the easiest possible operator usage. Color coding and labelling to identify proper settings for each detector. The analog meter dial allows for a more natural response.

Meter Body:

Indicated Use NORM Alpha, Beta, Gamma Survey
Pancake/Scintillator Switchable Internal External Switch
Internal Scintillator 1" NaI (Sodium Iodide)
Sensitivity 175 CPM/uR/hr
Multipliers x0.1, x1, x10, x100
Range 0-50uSv/hr
Linearity reading within +/- 10% of true value with detector connected
Response Fast (4 Seconds) Slow (22 Seconds)
Power 2 D Cell Batteries
Batery life 600 hours
Temperature Range -20 to 50 degrees celcius
Size 24.1 x 8.9 x 21.6 cm (9.5 x 3.5 x 8.5 in.) ( H x W x L), with handle
Weight 2kg with batteries and detector


Pancake Probe:


Energy Response Energy Dependant
Operating Voltage 900vdc
Window Density 1.7 mg/cm3 mica
Dead Time 80 uS
Sensitivity (Cs-137) 3300 CMP/mR/hr
Sensitive Area 15 cm2
Environmental -20°F (-28°C) - 140°F (60°C) | 5-95% RH
Efficiency 5% for 14C; 22% for 90Sr/90Y; 19% for 99Tc; 32% for 32P; 15% for 239Pu, ≤ 1% for 99mTc; 0.2% for 125I
Dimensions 4.6 x 6.9 x 27.2 cm (1.8 x 2.7 x 10.7 in.) (H x W x L)
Weight 1lb. (.5Kilos)
Construction Cast Aluminum & Powder Coat