Powerhouse Museum Collection Search 2.53
Category history:

Support the Powerhouse with a tax-deductible gift

Make a donation

Radiation detector 'Mini-monitor', 1980 - 2005
zoom image

Object statement
Radiation detector, 'Mini-monitor', metal / plastic, made by Mini Instruments Inc, Burnham-on-Crouch, Essex, England, 1963-2005
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 used in industrial gauging applications).

The equipment was used to measure the type and intensity of radiation and it exemplifies one of the many aspects of regulation administered by government health departments and augments the Museum's collection of measuring instruments and workplace health and safety material.

Written by Erika Dicker
Assistant Curator, 2007.
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.

 This text content licensed under CC BY-NC.

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.
Printed on face of radation detector, 'mini-monitor' / g-m meter type 5.10' and 'MINI-INSTRUMENTS'.
Printed on top of radiation detector, 'Serial no 10844'.
Production date
1980 - 2005
165 mm
167 mm
110 mm
1 kg

 This text content licensed under CC BY-SA.
Acquisition credit line
Gift of the Department of Environment and Conservation New South Wales, 2007
+ Occupational health and safety
Short persistent URL
Concise link back to this object: https://ma.as/365885
Cite this object in Wikipedia
Copy and paste this wiki-markup:

{{cite web |url=https://ma.as/365885 |title=Radiation detector 'Mini-monitor' |author=Powerhouse Museum |accessdate=21 February 2017 |publisher=Powerhouse Museum, Australia}}

Images on this site are reproduced for the purposes of research and study only. Whilst every effort has been made to trace the Copyright holders, we would be grateful for any information concerning Copyright of the images and we will withdraw them immediately on Copyright holder's request.
Object viewed times. Parent IRN: 2101. Master IRN: 2101 Img: 176339 Flv: H:3421px W:4308px SMO:0 RIGHTS:.