440RF/D Low Energy RF Shielded Survey Meter

CRT leakage measurement
Ideal for applications in high RF fields
Measure low energy radiation exposure down to 12 keV

The Model 440RF/D Low Energy RF Shielded Survey Meter is a highly sensitive, low energy, RF shielded survey meter suited for fast, accurate measurements of background and other low radiation levels. Survey meter design is based on CMOS microprocessor technology. The 440RF/D has Electrical Industrial Association approval and is designed to meet the radiation sensitivity and measurement geometry requirements for television receivers set forth by the US Department of HEW. 21 CFR 1020.10 requires "Radiation exposure rates produced by a television receiver shall not exceed 0.5 milliroentgens per hour at a distance of five centimeters from any point on the external surface of the receiver," as measured in accordance with this section.

Applications

The 440RF/D RF shielded instrument is the basis of measurement for radiation exposure in the color television industry. This instrument also is used to measure radiation from radar and transmission towers where RF may be present.

Features

Meets 21 CFR 1020.10 Television Receiver and 21 CFR 1020.40 Cabinet X-ray Systems requirements for radiation surveys
Insensitive to 10mW/cm² RF fields
Resolves 0.02 mR/h from 15 kilovolt x-rays
Auto-zeroing
CMOS design for stability and performance
Batteries accessible from outside instrument
Available in SI units

Specifications

Radiation detected Beta ray above 150 keV and gamma ray and x-ray above 12 keV

RF response No response in RF fields up to 10 mW/cm²

Operating ranges

440RF/D exposure rate in five overlapping ranges 0 to 1, 0 to 3, 0 to 10, 0 to 30, 0 to 100 mR/h
440RF/D-SI dose equivalent rate in five overlapping ranges 0 to 10, 0 to 30, 0 to 100, 0 to 300, and 0 to 1000 µSv/h

Response time 90% of final indication in:

Range	Response
0 to 1 mR/h (0 to 10 µSv/h)	7 sec
0 to 3 mR/h (0 to 30 µSv/h)	7 sec
0 to 10 mR/h (0 to 100 µSv/h)	5 sec
0 to 30 mR/h (0 to 300 µSv/h)	5 sec
0 to 100 mR/h (0 to 1000 µSv/h)	5 sec

Accuracy Within 10% of reading between 10% and 100% of full scale indication on any range, exclusive of energy response. Calibration at 21 keV x-ray (27.5 KVCP, 0.9 mmA/HVL)

Geotropism Within 2% of full scale in any orientation

Typical energy dependence

X-ray and gamma ray Within 10% from 12.5 to 42 keV
Maximum response peak of + 40% at 100 keV. Within 10% at ¹³⁷Cs and ⁶⁰Co with added equilibrium wall

440RF/D Low Energy RF Shielded Survey Meter Graph

Environmental

Temperature range 68° to 104°F ( 20° to 40°C )
Relative humidity 0 to 95%, non-condensing

Pressure dependence Internal software-controlled pressure transducer and temperature sensor automatically apply standard air density correction factors from 70 to 106 kPa to the unsealed ion chamber

Initial stabilization Approximately 30 seconds

Detector Internal ionization chamber 3.56 cm diameter by 5.87 cm long, cross sectional area 10 cm2 volume, with 1.5 mg/cm² aluminized mylar window and an external magnesium window 13 mg/cm² thick. Center of ion chamber volume is 5 cm from the plane determined by the tips of three plastic bumpers

Display 3.7 in (9.5 cm) meter scale, marked 0 to 3 and 0 to 10

Power requirements Five 9V batteries; 200 hours operation. Three in parallel configuration for - 18 V chamber bias

Controls Single rotary switch for power and range switching and spring-loaded check source switch

Zero adjust Auto-zeroing

Check source Built-in operational uranium check source provides constancy check of instrument *Due to recent international airline shipping policies/restrictions, radioactive "Check Source" will not be shipped with the main unit outside the US"

Housing material All metal, splash-proof

Dimensions 5 (w) x 8 (d) x 10.8 in (h) (12.7 x 20.3 x 27.6 cm)

Weight 6.8 lb (3.1 kg)

Shipping volume and weight 2.5 cu ft (0.071 m3) 13.3 lb (6.05 kg)

Available model(s)