Aware Coincidence Box

Aware Coincidence Box Decoder (C-Box): $85

Aware Triple Coincidence Box Decoder (Triple C-Box) $129
(For use with three RMs to plot Electromagnetic cascades in lead for generation of Rossi Curve. See below)

For a complete turn-key coincidence system, one C-Box plus:

Two RM-60s, RM-70s, RM-80s, RM-G90s or RM-G90-3 (see below) or any combination of RMs:
Price List

To interface C-Box to a USB port:
LCD-90 Pro

Note both the USB-MSP and the LCD-90 Pro can be controlled by standard ASCII characters and their output recorded with free Windows terminal programs, for example, Tera Term, Putty or Windows Hyper Terminal. On an Apple MAC one can use the built-in Screen command.

For a more complete, sophisticated, feature rich interface using the USB-MSP, LCD-90 Pro or a standard RS-232 serial port:
Aw-Radw Windows Program

Phone or write to order or for more details. AWARE ELECTRONICS CORP.
P.O. Box 4299 Wilmington DE 19807 USA
Email: (
Phone Orders \ Questions: 800-729-5397 or Phone \ Fax: 302-655-3800 Country of Origin for all Aware Electronic Corp. Products: USA

Cosmic Ray Air Shower Lateral Coincidences, Gordon McIntosh, University of Minnesota, Morris

To investigate the air showers we have been measuring the lateral coincidences among three Aware RM60 Geiger counters located at 0 cm, 15 cm, and 40 cm. Most of these measurements have been carried out at the surface. The rate of lateral, triple coincidences of Geiger counter with this configuration is 0.053 ±0.013 hr-1 at the surface.

On 4 April 2015 the UMM Modern Physics class made a balloon launch that included a measurement the lateral, triple coincidence versus altitude. Three triple coincidences were measured during the 1.75 hour flight. The rate of triple coincidences was 1.7±1.0 hr-1 . This rate is ~30 times the rate measured at the surface and indicates that showers of sufficient lateral extension to produce triple coincidences occur at a greater rate at higher altitudes.
Cosmic Ray Air Shower Lateral Coincidences

Solar Eclipse Muon Data

In Toledo, Ohio, two RM-60 geiger counters were placed in an horizontal position, connected to a coincidence detector, and the data was recorded with a LCD -90 Pro Micro-Controller Data- Logger for a 25 hour and 24 minutes time period from 2023 EDT on 08/20/17 to 2147 EDT on 08/21/17. (The equipment names and models refer to the products from the Aware Electronics Company.)

Using a computer, a graph was made of the data showing the muon flux level vs time. The muon flux counts were grouped into 120 minute periods on this graph. A regression analysis was also performed which is shown by the slopping line on the graph.

Eclipse Muon Flux - Toledo Ohio

Two RM-60s and a C-Box:

Two RM-60s and a C-Box

Two RM-60s and a C-Box

For information about the Muon Project and online sites see:
The Muon Project

We also construct custom made radiation monitors, for example the RM-G90-3 with three RM-G90 type tubes. These have a gamma sensitivity of 28,800 cpm/mR/hr, Cs137 gamma, and operate the same as all our RMs, i.e. directly connected to a serial port, our USB-MSP and/or our LCD-90.

When two RM-G90-3 devices are connected to our Coincidence Box and placed directly on top of each other, they provide a Cosmic Ray count rate of ~140 Counts per Minute.

Click on photos to enlarge:
RM-G90-3 Scan

QuarkNetter Reports: The Geiger Detector

Two RM-60s and a C-Box

The Chinese University of Hong Kong. Muons in Cosmic Rays:
Special Experimental Projects

Two RM-60s, C-Box and Lead Brick

We now sell a triple coincidence box (Triple C-Box $129) for use with three RMs to plot Electromagnetic cascades in lead for generation of Rossi Curve.

Rossi Curve Info.:
Wikipedia Rossi curve
Demonstrating cosmic ray induced electromagnetic cascades

Bruno Rossi info.:
Bruno Rossi

Reproducing Rossi's cascade experiment using three RM-80s, one Triple C-Box or two C-Boxes, one USB-MSP or LCD-90 Pro, and Aware software or your own interface software

Also needed lead or iron absorber sheets, 6” x 6” to 12” x 12” or larger, various thicknesses. Suitable lead absorbers can be made from lead flashing used in the building industry. McMaster Carr sells lead sheets McMaster Carr Lead Sheets

Also needed spacers to hold the pile of lead sheets ~2.5cm above the RM-80 windows.

Place three RM-80s on a table, on their backs, with the windows facing up. Position them in a triangle formation such that the windows are as close as possible to each other.

Place the spacers around the R-80s then place the lead sheets on top of the spacers. Size the spacers to provide an ~2 to 3cm gap between the top of the RM-80 windows and the bottom of the lead sheets.

Plug the three RM-80s into the Triple C-Box and plug the Triple C-Box into the USB-MSP or LCD-90. Start recording the coincidences per hour. Every hour or more, add an additional absorber sheet to the pile. Plot the coincidences per hour versus total thickness. It should generate a graph similar to the following:

Shower curve obtained by Rossi using a triangular arrangement of GM tubes

Bruno Rossi's "Cosmic Ray Telescope":
Cosmic Ray Telescope

A Quantum Entanglement Experiment. Demonstrate Spooky Action at a Distance using two of Aware’s RM-60s or RM-80s, and one of Aware’s Coincidence Box (C-Box)

  • How to Build Your Own Quantum Entanglement Experiment, Part 1
  • How to Build Your Own Quantum Entanglement Experiment, Part 2


  • Coincidence Experiments using two RM-60s:


    "We propose to explore the nature of cosmic particles by proposing an astute combination of measurements made in spatially distinct points by several Geiger counters. The analysis of the signals acquired by these detectors, and in particular the quasi-simultaneous measurement of the passage of ionizing particles by several detectors, makes it possible to supplement the information on the dose rate with information about the direction of incidence of the particle. We thus reproduce a number of experiments, according to a so-called coincidence strategy, which made it possible more than 70 years ago to elucidate the nature of the cosmic particles.

    Two RM-60s fixed on an equatorial plank

    Experimental implementation of the coincidence method by means of two Geiger counters fixed on an assembly (equatorial plank) allowing to vary the zenith angle. Top right: output voltage of each Geiger counter, illustrating the events observed in coincidence (pulse in the middle of the screen) and the rejection of the signals observed by a single detector (pulses on the bottom trace, right half of the 'screen).
    Two RM-60s and lead

    Experimental set-up: The two Geiger counters are in a configuration in which they have little probability of detecting an incident cosmic ray and only the sheaves of particles induced by interaction with the lead sheets can induce a simultaneous response of the two detectors. The lead sheets are 2 mm thick and a number ranging from 0 to 10 sheets are placed on the counters. All the leaves are cut out according to a square of 5x5 cm2.
    Two RM-60s and lead
    Interpretation of the measure. The "two-count" configuration of the two counters has only a small probability of detecting an incident particle (blue), and only the creation of a spray of secondary particles (red) reaching "both" Interpret the results of measurements.

    Art and Muons. Aware's equipment used in Paris art exhibit NOX-MATTER:
    NOX-MATTER A study for Muons and Silence
    Another link about NOX-MATTER Study for Muons and Silence

    Aware's C-Boxes each paired with two RM-60s utilized in NOX-MATTER:

    An artist wiring NOX-MATTER:

    E-mail questions received:

    > I have 2 of your RM-80 units, and was curious about the Coincidence Box Decoder.
    > 1) Does the Coincidence Box power both units from the serial port(s), or does it require a battery?
    Both units and the Coincidence Box are powered from one serial port no problem.

    > 2) Does it require 2 serial ports?
    Only one serial port is needed for the coincidence counts. If you want also to gather rad data from the two RM units at the same time, an extra serial port per RM is needed, for a total of three, that is, one serial port for the coincidence counts and one serial port for each RM. In this case, the telephone cable from each RM is split into two lines with a telephone line splitter ($1.00). One of the lines from each RM goes to the coincidence box, and the other line goes to one of the serial ports.

    > 3) Do 3 separate graphs result (one from each unit and a coincidence one?
    Yes, with the above setup. Otherwise, with one serial port, just coincidence counts are plotted.

    > 4) Could a fan-filter be put on one and still have it record the coincidence counts?
    Coincidence counts result when an ionizing particle passes through both tubes. The closer the tubes, the more likely a muon will pass through both. You could place one RM-80 with fan-filter on top of the second RM-80 such that a good percentage of the muons passing through the RM-80 with fan-filter will also pass through the other RM-80, if both windows are oriented horizontally, since the majority of muons pass vertically from the sky down.

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