Radiation detector ‘Mini-monitor’

Made by Mini Instruments Ltd in Burnham-on-Crouch, Essex, England, United Kingdom, Europe, 1980-2005.

These various radiation meters were originally procured and/or used by the NSW government agencies including the former State Pollution Control Commission (SPCC), the Environment Protection Authority (EPA), the NSW Department of Environment and Conservation (DEC), and possibly the NSW Department of Health. These agencies, collectively over the years regulated the use of radiation apparatus (for example x-ray machines used in medical diagnostics) and radioactive substances (for example cobalt-60 ...


The detector is encased in a grey metal casing. The front of the unit is grey and shows a 'counts per second' meter in a window, a black 2 position switch, and a grey rotary 3 position switch (off, battery check,on). On the top of the unit is mounted a rod shaped grey probe with a red tip and is attached with a curly electrical cord.


165 mm
167 mm
110 mm
1 kg


Radiation detector made by Mini Instruments Inc in Burnham-on-Crouch, Essex, England, between 1980-2005

Mini Instruments was developed in 1963 and currently (as of 2007) Thermo Scientific are the producers of 'Mini Instruments'.

The mini monitor is well established in teaching, research, hospital and industrial laboratories as a reliable, convenient, and inexpensive contamination meter. The machine has 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. There is also a speaker to give an audible estimation of radiation intensity. There is an alarm which can be set to trip at any level on the scale. The unit can be battery or mains operated.

Geiger counters are used to detect ionizing radiation, usually alpha and beta radiation, but other types of radiation as well. The sensor is a Geiger-Müller tube, a gas-filled tube (usually helium, neon or argon with halogens added) that briefly conducts electricity when a particle or photon of radiation temporarily makes the gas conductive. The tube amplifies this conduction by a cascade effect and outputs a current pulse, which is indicated by a needle or lamp and/or audible clicks. Modern instruments can report radioactivity over several orders of magnitude.
Mini Instruments Ltd 1980-2005


Gift of the Department of Environment and Conservation New South Wales, 2007
5 June, 2007

Cite this Object

Radiation detector 'Mini-monitor' 2016, Museum of Applied Arts & Sciences, accessed 19 November 2017, <https://ma.as/365885>
{{cite web |url=https://ma.as/365885 |title=Radiation detector 'Mini-monitor' |author=Museum of Applied Arts & Sciences |access-date=19 November 2017 |publisher=Museum of Applied Arts & Sciences, Australia}}
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