Model 2401-P

Pocket-Size Survey Meter with Pancake GM

Part Number: 48-2875

Features

Self-Contained Survey Instrument
Integrated GM Pancake Detector
Simple to Use
Low Cost
Rugged

The Model 2401-P instrument is a general purpose, pocket-size radiation detection meter designed around the venerable GM pancake detector. A simple switch allows the user to choose among the three ranges. Another switch selects between QUIET (click-per-event audio off), NORMAL, BAT CHECK, or OFF. The detector is conveniently packaged inside the instrument with a protective screen window. This instrument is available with a variety of meter faces for measuring contamination and exposure rate (see list on the Meter Faces tab).

Medical Application

This meter is great for measuring low-level surface contamination of beta emitting isotopes, or for locating dropped or lost (therapeutic) seeds in the Radiology or Nuclear Medicine departments.

Specifications

Indicated Use	Alpha, Beta, Gamma survey
Detector	Pancake GM with stainless steel protective screen (79% open)
Window	Active: 15.51 cm² (2.4 in²) Open: 12.26 cm² (1.9 in²)
Range	0 to 200 mR/hr 0 to 660 kcpm
Sensitivity (¹³⁷Cs gamma)	Typically 3300 cpm per mR/hr
Efficiency	¹⁴C: 5% ⁹⁰Sr/⁹⁰Y: 22% ⁹⁹Tc: 19% ^99mTc: < 1% ³²P: 32% ²³⁹Pu: 15%
Energy Response	Energy dependent
Meter Dial	0 - 6.6 kcpm, 0 - 2.0 mR/hr, BAT OK (Meter Faces tab lists other available meter faces)
Multipliers	x1, x10, and x100
Response Time	Typically 11 s from 10% to 90% of final reading
Alarm	No
Audio	Click-per-event, may be turned off by moving selector to QUIET position
Power	9 volt battery
Battery Life	Typically 250 hours with alkaline battery
Construction	Cast and drawn aluminum with membrane panel
Size (H x W x L)	4.6 x 8.4 x 13.5 cm (1.8 x 3.3 x 5.3 in.)
Weight	0.4 kg (0.9 lb), including battery

Meter Faces

This table lists the most commonly used meter faces.

Meter Face	Image (click to view larger)	Description
202-850		0 - 6.6 kcpm 0 - 2 mR/hr BAT OK
202-857		0 - 500 cpm 0 - 0.15 mR/hr BAT OK
202-872		0 - 10 cps 0 - 1.9 µSv/h BAT OK
202-916		0 - 500 cpm BAT OK
202-992		0 - 1.65 kcpm 0 - 0.5 mR/hr BAT OK
202-994		0 - 0.15 mR/hr BAT OK
202-999		0 - 1.5 μSv/h BAT OK
202-1038		0 - 6.6 kcpm 0 - 20 µSv/h BAT OK

Options

Option	Description	Part Number
Model 2401-Series Handle	This convenient L-shaped handle provides a secure and comfortable grip for the Model 2401-Series survey meters.	4397-165
Model 2401-Series Belt Clip	Adds a belt clip to the back of the instrument for ease of carrying.	4397-176
Model 2401-Series Wrist Strap	Adds a wrist strap to the instrument for ease of carrying.	4397-182
Model 2401 Series Hard Case	Rugged case providing crushproof, water resistant, and dust proof protection.	2311119
Model 2401-Series Canvas Case	Canvas case with a zip closure.	2310517

Description	Part Number
GM Tube	01-5008