Low Energy RF Shielded Survey Meter

Features

The 440RF/D is a highly sensitive, low energy, RF shielded survey meter suited for fast, accurate measurements of background and other low radiation levels. In particular, the 440RF/D is used to measure radiation exposure in the color television industry (cathode-ray tube leakage), radar and transmission towers where RF may be present, and surveying applications in high RF fields. Approved by the Electronic Industries Alliance, the 440RF/D is designed to meet the radiation sensitivity and measurement requirements for television receivers set forth by the US Department of Health and Human Services. Entitled “Performance Standard for Televisions Receivers” (21 CFR 1020.10), this standard requires that “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.”

Features

• Meets US Dept. HHS radiation survey requirements for Television Receiver and Cabinet X-ray Systems requirements (21 CFR 1020.10 and 21 CFR 1020.40, respectively)
• Insensitive to 10 mW/cm2 RF fields
• Resolves 0.02 mR/h from 15 kV x-rays
• Measures low energy radiation exposure down to 12 keV
• Auto-zeroing
• Batteries accessible from outside instrument

Specifications

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

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

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

Temperature range
20 °C to 40 °C (68 °F to 104 °F)

Relative humidity
0 to 95 %, non-condensing

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

Power requirements
Five 9 V batteries; 200 hours operation. Three in parallel configuration for electronic supplies and 2 in series configuration for-18 V chamber bias.

Controls
Single rotary switch and spring-loaded check source switch

Zero adjust
Auto-zeroing

Check source
Built-in operational uranium check source

Housing material
All metal, splash-proof

Dimensions (WxDxH)
12.7 cm x 20.3 cm x 27.6 cm (5 in x 8 in x 10.8 in)

Weight
3.2 kg (6.8 lb)

Shipping vol/wt
0.071 m3 (2.5 cu ft) 6.05 kg (13.3 lb)

Operating ranges
440RF/D exposure rate in five overlapping ranges: 0 to 1, 0 to 3, 0 to 10, 0 to 30, and 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

Product Number: 440RF/D

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