Ludlum Model 239-1F with Model 2350-1

  Floor Radiation Monitor

●  Alpha, Beta, Gamma Floor Radiation Monitor

●  425 cm² Gas Proportional Detector

●  Utilizes Ludlum Model 2350-1 Digital Ratemeter/Scaler/Logger

●  Adjustable Detector Height

●  Efficiency: ²³⁹Pu - 17%, ⁹⁰Sr⁹⁰Y - 25%, Gamma < 1%

The Model 239-1F Floor Radiation Monitor is an alpha beta gamma radiation gas proportional floor monitor detector mounted on a roll-around cart. The instrument features a flow system, quick-connects, a gas bottle mount, and a means to adjust the height of the detector from the floor for optimum performance. A nuclear counting gas bottle, gas regulator, and a survey instrument are required for the operation of the floor monitor. This unit is supplied with the Model 12 Analog Radiation Survey Meter. Refer to the Model 2350-1 for additional detail.

PART NUMBER: 48-2594

ELECTRONICS: Ludlum Model 2350-1

APPLICATION: floor monitoring for alpha, beta, gamma radiation
RADIATION DETECTOR: gas proportional
RECOMMENDED COUNTING GAS: P-10 (10% methane; 90% argon)
CYLINDER SIZE: will hold a cylinder 6 x 19 in. (15.2 cm x 48.3 cm) (Dia x H) or smaller (Linde size “Q”, Matheson size 3, Airgas size “R”)
WINDOW: 0.8 mg/cm² aluminized mylar (window thicknesses of 0.4, 3.9, or 7.9 mg/cm² are available)
ACTIVE AREA: 584 cm²
OPEN AREA: 425 cm²
EFFICIENCY (4π): 17%-²³⁹Pu; 25%-⁹⁰Sr/⁹⁰Y; gamma < 1%
GAS RECHARGE: will operate on static charge for 2 hours
DETECTOR HEIGHT: adjustable from 0.125-3 in. (0.32-7.6 cm) from surface
DETECTOR OPERATING VOLTAGE:

Alpha: Typically 1000-1200 volts
Beta Gamma: Typically 1600-1800 volts

THRESHOLD: typically 2-4 mV
FLOW METER: IN - adjustable from 0-100 cc/min; OUT - flow indicator from 0-100 cc/min
GAS CONNECTORS: double end quick disconnect for 0.25 in. (0.6 cm) OD tubing
GAS CONSUMPTION: typically 50 cc/min
CONSTRUCTION:

Detector: anodized aluminum housing with stainless steel hex protective screen (79%open)
Cart: 1 in. (2.5 cm) square tubular steel and aluminum with beige powder coat paint, 7.5 in. (19.1 cm) diameter rear wheels, and 4 in. (10.2 cm) diameter swivel casters

DETECTOR SIZE: 0.8 x 6.3 x 18.3 in. (2 x 16 x 46.5 cm) (H x W x L)
CART ASSEMBLY: 42 x 16 x 27.5 in. (106.7 x 40.6 x 69.9 cm) (H x W x L) (excluding detector)
WEIGHT: 25 lb (11.4 kg), excluding gas bottle and counting instrument

CE CERTIFIED: yes

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