Handheld Geiger Counter Dosimeter

$155.65 incl. 15% GST

This is a small handheld geiger counter that lets you measure dose quantities of ionizing radiation (Beta, Gamma and X-Ray).


This is a small handheld device that lets you measure dose quantities of ionizing radiation (Beta, Gamma and X-Ray).

As soon as you turn it on it gives you 3 readings

  • Real Time μSv/h (that is microsieverts per hour)
    that’s the radiation the geiger counter picks up at this very moment
  • Average μSv/h
    the average radiation the geiger counter picks up over a period of time to give a more stable result
  • cumulative mSv/h (that’s millisieverts per hour)
    how much radiation the geiger counter was exposed to since you turned it on


Please keep in mind that when you turn this Geiger counter on it is going to pick up a small amount of radiation even in cases where you do not expect to encounter higher levels of radiation. Normally this will be around 0.1 – 0.2 μSv/h. This is perfectly normal and not hazardous in any way! What you are picking up in this case is the natural radiation that essentially exists everywhere and is due to cosmic rays.


Background information:

sievert is a unit to quantify the amount of ionizing radiation (“effective dose”)

millisievert per hour (mSv/h) means 1/1,000 Sievert of radiation per hour

microsievert per hour (μSv/h) means 1/1,000,000 Sievert of radiation per hour


People normally are exposed to 1 – 3 millisieverts per year (that means 0.11 μSv/h – 0.33 μSv/h)

In a CT scan, the organ being studied typically receives a radiation dose of 15 mSv in an adult.

A typical chest X-ray involves exposure of about 0.02 mSv, while a dental one can be 0.01 mSv.

According to the Radiation Safety Act of 2016 an average dose of 20 mSv per year over the course of 5 years is considered the safe limit for occupational exposure (meaning for people that work with/around devices emmiting radiation.)

Exposure to 100 mSv a year is the lowest level at which any increase in cancer risk is clearly evident.

400 mSv/h were the maximum radiation levels recorded at Fukushima plant on 15 March 2011

1 sievert (1,000 mSv) of exposure in a very short period of time causes radiation sickness such as nausea, vomiting, hemorrhaging, but not death. A single dose of 5 sieverts would kill about half of those exposed to it within a month.

During the Chernobyl disaster the radiation levels in the worst-hit areas of the reactor building, including the control room, have been estimated at 300Sv/hr, (300,000mSv/hr) providing a fatal dose in just over a minute


Model: BR-9B

Screen size: 57 * 43mm / 2.2 * 1.7in

Detectable Radiation: Beta, Gamma, X-ray

Real-time range: 0-99.99μsv/h

Cumulative range: 0-99.999msv

Real-time error: ≤10%

Mean error: ≤3%

Battery: 3 * AA 1.5V battery or 3 * 1.2V rechargeable battery (not included)

size: 105 * 70 * 30mm

weight: 106g


batteries not included

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