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Revision 5

April 2008

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2.6 Over the Air Communications

900 MHz or 2.4 GHz FHSS (Frequency Hopping Spread Spectrum) Radios with External Antenna (WRM

system) – Base receiver required for use with WRM

or WRM91, EXT-2000 External Transmitters and WRM-

Plus receiver.

2.7 Response Times for the GM Tubes

Table 1

Response Time for Small Changes

Table 2

Fast Response Time

Radiation Field

Range

[mR/h]

Response

Time

[sec.]

Radiation field

[mR/h] from

to/above

Response

Time

[sec.]

< 0.5 45 0.05 1.0

≤ 2

0.5 - 1.5

30 0.5 3.0

≤ 2

1.5 - 2.5 20 1.5 5.0

≤ 2

2.5 - 6 10 2.5 12

≤ 2

6 - 12 6 6 20

≤ 2

12 - 24 4 12 40

≤ 2

20 - 60 3 20 60

≤ 2

60 - 800 2 1 R/h 2 R/h

≤ 2

0.6 - 1.2 R/h 5 2 R/h 2.6 R/h

≤ 2

1.2 - 2 R/h 4

2 - 3 R/h 3

3 - 10 R/h 2 – 3

> 10 R/h

≤ 2

If the radiation field measured by the meter increases significantly, the response time will be ≤ 2 sec. as seen in

Table 2. In other cases the response time is according to Table 1.

For example:

• For a radiation field increase from 2.5 mR/h to 12 mR/h, the response time will be ≤ 2 sec.

• For radiation field fluctuations between 2.5 mR/h and 6 mR/h, the response time will be 10 sec.

2.8 DRM-1/2D Response Times for the CsI (TL) Detector

The instrument’s response time is less then 2 seconds once the radiation intensity at the reference point increases

or decreases by a factor of 10. e.g 0.001 to 0.01 mR/h (1µR/h to 10µR/h).

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