Model 4901P Hand and Foot Radiation Monitor

Ludlum Model 4901P hand and foot radiation monitor

Indicated Use: Personnel monitoring
Detectors: Pancake type Halogen quenched G-M in 0.25" lead shield
Window: 1.7 ± 0.3 mg/ cm² mica
Energy Response: Energy dependent
Hands: 10 ea. (5 per hand)
Active Area - Approximately 75 cm²
Open Area - Approximately 60 cm²
Efficiency(4pi) - Typically 3%-14C, 12%-99Tc, 12%-137Cs
Shoes: 12 ea. (6 per shoe)
Active - Approximately 90 cm²
Open - Approximately 72 cm²
Efficiency(4pi) - Typically 3%-14C, 10%-99Tc, 10%-137Cs
Audio: Built in unimorph type speaker (greater than 68 dB at 2 feet)
Alarm: Indicated by red LED’s, and audible signal (each hand and foot has alarm indicators)
Counting Capacity: 9999 counts per minute
Count Time: Adjustable from 1 – 99 seconds
Alarm Hold Time: Adjustable from 1 – 99 seconds
Background Accumulate Time: Adjustable from 1 – 99 seconds
Background Update Interval: Adjustable from 1 – 99 minutes. (system will automatically reevaluate background if instrument is not in use)
Force Update: Timed function to force background update if regular update interval is exceeded.
Ready: (green LED) Indicates instrument is ready to monitor personnel
Counting: (green LED) Indicates count is in process (activated by switch in hand cavity)
Check OK: (green LED) Indicates person being monitored is under alarm limits
Short Count: (yellow LED, and continuous audible beep) Indicates user has released hand switches before count is complete or count is attempted during background update.
Power: 95 - 240 VAC, 50-60 Hz single phase (less than 100 mA )
Construction: Aluminum housing with beige polyurethane enamel paint
Temperature Range: 32°F (0°C) to 122°F (50°C) (LCD limits temperature range)
Size: 29.5" (74.9 cm)W X 40" (101.6 cm)H X 15" (38.1 cm)D
Weight: 45 lbs (20.5 kg)

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