Radiation Detectors, Monitors, Alarms
MINIRAD, DIGIRAD, ZONE-MONITOR,
DOSIRAD, RAM-I


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All products from PULSECHO are backed
with a one year limited guarantee and a fast/efficient repair service from our factory.

Meet "ALARA"
As Low As Reasonably Achievable

minimum exposure for radiation personnel..

A range of various models of survey meters and monitors/alarms to meet all requirements for measuring radiation levels from radiation sources, isotopes and x-ray machines. Their wide energy response offers versatility for use in a multitude of radiological applications like nuclear gauging, measuring exposure rates in occupied places and industrial/medical radiographic installation for measuring leakage radiation levels around cameras; tracing lost sources and as an educational/general purpose survey meters. All these instruments use GM Counter as detector and a regulated EHT circuit for stable operation. They are rugged and have proved themselves in the field. These radiation detectors are calibrated on our own calibration facility with readings traceable to the RSL standards at DRP, BARC. 


MINIRAD This was our first model to be approved by DRP. It meets all the requirements of a wide range survey meter. Excepting the display the meter is fully solid-state using CMOS ICs. Radiation levels are displayed on a meter in four decade ranges.

MINIRAD-LED This model takes advantage of the solid-state display viz. LEDs. A bar graph of LEDs in place of a meter indicates the radiation level. Other indications like low batt, over range, count, range etc. are also indicated by LEDs. The luminous display makes it ideal for night time use.

DIGIRAD This digital model incorporates advance techniques of auto ranging and auto/manual response time. The response time is fast enough to indicate changes in radiation field and slow enough to take a meaningful reading. It is auto ranging with over range indication and a switch-off timer. It will continuously display readings in the range 0 to 2000 mR, hence, there is no need to switch ranges and use multiplying factors.

ZONE MONITOR Gamma Area/Zone Monitor Type ZM is an instrument designed to measure and monitor gamma radiation exposure rates in the working areas of industrial radiological installation, radiation source rooms and other radio-isotope laboratories. Audio/Visual alarm is provided to alert the radiation worker when radiation level exceeds the normal or other limits which can be preset. The Gamma Area/Zone Monitor incorporates GM counter as radiation detector and works from mains with a battery back-up in case of mains failure. The self diagnostic circuitry of the ZM gives a non-resettable alarm if there is a circuit/GM Tube failure.

DOSIRAD This is a pocket size dose meter for measuring cumulative dose of x-ray and gamma ray radiation from isotopes and other radiation sources. It has a wide range (2000mR) with high DIGITAL resolution (0.01mR) and gives a audible chirp every 0.01 mR dose. It operates for 10 to 20 hours from dry cell and may be operated continuously using a rechargeable battery with charger.

RAM-1 is a fully solid-state light weight miniature audible alarm/warning systems that can be used as a Personal Monitor or as an interlock failure detector. It emits a high pitched chirp which increases in repetition frequency as the level of radiation increases. This chirp becomes a continuous sound if the battery becomes low. There are two settings 2 and 60 chirps per minute in one mR/h field. 

TECHNICAL
DATA
MINIRAD MINIRAD
LED
DIGIRAD ZONE MONITOR DOSIRAD RAM-I
DETECTOR

GEIGER MÜLLER COUNTER (GM TUBE)

RADIATION DETECTED

BETA (b ) GAMMA (g ) AND X - RAYS

ENERGY RESPONSE

100 KeV TO 1.3 MeV

50 KeV TO 2 MeV

RANGE STANDARD 0-5, 0-50, 0-500mR, 0-5R 20, 200, 2000 mR
AUTO RANGING
0-100 mR LOG SCALE 0-9999.99mR 2 & 60 CHIRPS/MIN IN 1 mR/H
LOW 0-0.5, 0-5, 0-50, 0-500 mR 20, 200, 2000 mR
AUTO RANGING
ACCURACY WITH Cs 137

± 20%

± 15%

± 20%

RESPONSE TIME 10 SECONDS 10 & 60 SECONDS 20 SECONDS INSTANTANEOUS
OPERATING CONDITIONS 0 TO 50° C AND 90% RH (NON-CONDENSING HUMIDITY)
DISPLAY VISUAL METER LED BAR GRAPH DIGITAL METER DIGITAL -
VISUAL FLASHING LED FLASHING + SIGN FLASHING LED -
SOUND PIEZO BUZZER CHIRPS PIEZO BUZZER & LIGHT ALARM PIEZO BUZZER CHIRPS
BATTERY TYPE 5 NOS. PENLITE 4 NOS. PENLITE 230v/6 PENLITE 9v (EVEREADY 216 TYPE)
CHECK METER LED DISPLAYS ‘LO BAT’ METER CONTINUOUS SOUND INDICATION
LIFE HRS 50/60 30/40 50/60 30/40 20/30 60/80
SPECIAL FEATURES PUSH BUTTON RANGE SELECTION LINEAR SCALES DIGITAL AUTORANGING SWITCH OFF TIMER SLOW/FAST RESPONSE SELF DIAGNOSTIC MAINS/BAT OPERATION SOUND/LIGHT ALARM SETTABLE ALARM LEVEL ULTRA SMALL COMPACT WITH POCKET CLIP
LOW COST NO MOVING PARTS LED BAR GRAPH
OVER RANGE INDICATION DIGITAL DISPLAY LOW COST
CONTROLS A) ON/OFF B) RANGE SELECT ON/FAST SWITCH REFER PHOTOGRAPH ON/OFF A) ON/OFF
B) SENSITIVITY
CONSTRUCTION AL. FABRICATION ABS PLASTIC M.S. FABRICATION ALUMINUM EXTRUDED CHANNEL
SIZE (in mm) L x W x H 140 x 80 x 40 145 x 80 x 40 145 x 80 x 40 260 x 150 x 100 125 x 50 x 25 115 x 50 x 25
WEIGHT GRAMS 400 300 300 2.5 KGS 175 150
10 micro Sievert = 1 milli Roentgen

10 milli Sievert = 1 Roentgen

Note : Colours are used to improve readability only !

An end windows GM tube to detect Beta (b ) radiation (counts/sec.) can be incorporated in MINIRAD-Low Range.