Monitors for Radiation Control

Series 900

The mini monitor is well established in teaching, research, hospital and industrial laboratories as a reliable, convenient and inexpensive contamination meter.


FEATURES:
• A large logarithmically scaled meter with an open scale at the lower end to
show background levels of radiation while displaying high levels without
switching
• A speaker to give an audible estimate of radiation intensity
• An alarm which can be set to trip at any level on the scale
• Battery or mains operation using a separate power unit. Included is an
internal constant current charger for rechargeable batteries
• Lightweight aluminum case
• A comprehensive manual containing tables and curves of response to
different radiation's and other useful information
• The monitor conforms to the requirements of the International
Technical Commission publication 325



PHYSICAL CHARACTERISTICS 2
Weight: 1.0 kg
Size: 180w by 110d by 165h mm overall
Batteries: 6 type AA cells, alkaline (IEC LR6) or rechargeable (IEC KR15/51).
Battery Life: Approximately 300 hours at 4 hours/day. (alkaline cells)
Paralysis Time: Scale corrected to give true count rate.
Ratemeter Integration Time: 1 to 4 seconds set to match count rate
Radiation Detector: Halogen quenched GM tube
Radiation Detected: Gamma and X-Rays only
GM Tube Supply: 300-700 volts preset for tube type
Overload Protection: No meter "fallback" with intensities at least 100 times full scale reading
Main Power: 12-18 volts DC from mains unit
Energy Response: Exposure based response of types R, G and D shown above. Consult factory for ambient dose equivalent response versions

Monitors are delivered complete with alkaline batteries, GM tube and instruction manual. Rechargeable batteries are fitted on request. Mains power units are available for all series 900 monitors.

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TYPE R
A monitor scaled over the range 0.5 to 5000µSv h-1 (0.05 to 500mR/h). The GM Tube is compensated to give a useful response from 45keV to 1.25MeV and above. It is not recommended for monitoring X-radiation from apparatus operating below 75kVp.


TYPE G
A sensitive instrument for environmental use. The monitor is scasled over the range 0.05 to 75µSv h-1 (0.005 to 7.5mR/h). The useful energy range is 45keV to 1.25MeV and above. This instrument is not suitable for monitoring X-radiation.

TYPE D
A monitor using a partially compensated GM tube to obtain an extended low energy response. The instrument is scaled over the range 0.5 to 1000µSv h-1 (0.05 to 100mR/h). The useful energy range is from 30keV to 1.25MeV but response is maintained down to at least 17keV. It is suitable for measuring radiation from X-Ray apparatus operating at or above 45kVp.

TYPE X
This instrument is scaled 0.5 to 2000 counts per second and uses an end window GM tube without energy compensation. It is sensitive to radiation down to 10keV and is therefore useful for locating X-Ray leakage from a variety of systems including high voltage equipment where X-Rays are generated adventitiously. It is not recommended for measurement but as a relative check device.


Please note: 1 Bq cm-1 ~ 2.7 x 10-5 µCi cm-2 Sensitivity data derived from tests carried out by the NRPB.
Contamination response figures are given for a probe to source distance of 1 cm.