Review: MrGhost EMR detector

Adding to my list of sensors and scanners, if you recall the APOC Radiation Detector I reviewed some time ago, here's another one that I've had for a while and then came across it again recently.

I had backed this on Kickstarter, specifically because I wanted to add to my list of spectrums I could detect, surpassing the Gamma and x- rays, and the occasional Alpha particle. It was for a detector that would connect to an iPhone or similar product and an app to drive the detection process. The app and Device go by the funny name Mr.Ghost, and takes a page from the PKE Meter from Ghostbusters although it's fundamentals are based on the material world rather than the preternatural. The creator goes to lengths to state the app is intended for entertainment purposes only and does not provide true ghost detecting functionality.

EM radiation stands for "electromagnetic radiation" is a wave-like form of energy like microwaves, visible light, and x-rays. EMF stands for "electromagnetic field" and is the near field part of EM radiation. Any time you have electrons moving through wire (like in the power supply of your appliances), it generates an electromagnetic field. Mr.Ghost acts to detect this field and is specifically tuned to detect AC electricity.

MrGhost is the companion app for the Mr.Ghost EMF detector that plugs into the headphone jack of your device. I've used it for both my iPad and iPhones, and never had any trouble. For those without the peripheral, the app will still work as an advanced sound level detector with your regular microphone so it is fun to use either way.

The readouts of the app show both the strength of the signal at the top, listed in RMS,
typical readings are 12-60 for fluorescent lights, 20-30 for wall-adaptors, 100-200 for dimmer switches, 200-400 for flatscreen TV's and 2000-4000 for old CRT tv's.

The second window shows either a spectral analysis of the emissions  or its waveform, giving you an impression of the nature of the emissions. The spectral analysis starts at approximately 10hz on the left and moves up to 22,000hz on the right.

The third window gives a sliding record of signal strength over time, based on the RMS reading from the main window.

The control sliders at the bottom control sensitivity, and the one below that allows you to set an offset, to baseline the device you are scanning with the Mr.Ghost from. There are also "record" and "send memory" options to capture your particular observations be email.

There are in fact three "modes" to the MrGhost app: primary scanning, gyro-mode and glow-mode. These are accessed by swiping left or right from the main window.

In gyro mode, the main window gives a block of the same scaled-by-colour signal strength as with th primary mode, blue being lowest, through grey to yellow, orange and red to white. It also gauges strength by proximity. The app ties into the iPhone gyroscope to giv you a real time, directional signal.  Adjust the sensitivity all the way left, and swing your phone back and forth in gyro mode and see the direction of high powered emitters. Very good if you're trying to pinpoint a obfuscated power source, like faulty wiring, a secreted transmitter or perhaps whatever spook keeps moving the remote control. .


Glow mode fills he entire screen with the signal detection colour of the gyro-mode, but without an extra data, just full screen colour. It glows brighter/hotter based on emission level, it also allows recording of your detected signals if you can film or time-lapse your detection to paint a light-picture of signal strength.

One thing that Mr.Ghost will not detect is the mobile phone you use to drive it and capture the signals. It was designed such that the EMF coming from the iPhone is generally above the 22.05khz cutoff that the detector senses. This means you can use it without having to turn on airplane mode, and without contaminating your data capture. Mobile devices do cause a tiny amount of baseline signal which the offset feature can handle easily. It does not affect functioning. 

This does mean however that you can't use it to find your lost phone ...

Overall, his is a fun peripheral and well or together app. It is a bit tricky to get the settings right so you can capture meaningful data, and it's not a professional industrial espionage signal detector, but for what it is, it's totally worth getting and waving around to gauge what all the trappings of modern life are radiating at you. 

Events: Nagasaki 70 years on

What if the 1945 "Fat Man" bomb was dropped on Melbourne today?

Following on from my "Trinity Day" post a few short weeks ago, a chilling reminder. It is now 70 years ago since, on August 9th, 1945, at 11:01:47am the Fat Man bomb exploded some 500m above Nagasaki, Japan, outright killing between approximately 39,000 and 80,000 people. The blast was estimated at around 20kt, and it set fires through the mostly wood and paper construction of the city that left it devastated, even before the radiation effects began to manifest.

What if a 10kt "dirty bomb" was detonated in downtown Melbourne?

Some very clever people at Stevens Institute of Technology, namely nuclear historian Alex Wellerstein developed  “NukeMap” which allows you to overlap various atomic and nuclear events over a regular GoogleMaps view. You've seen this kind of effect with the Sea-Levels which I discussed in my Rising Sea-Levels post. The NukeMap application demonstrates the estimated (and extrapolated from actual tests) effects of these weapons on built-up areas, including "Fireball radius", "20psi Air Blast radius", "5psi Air Blast radius", Radiation Radius" and "Thermal Radiation Radius", each with a descriptor of the kinds of damages you could expect to see, and survivability of those effects.

What if the currently deployed 800kt Russian "Topol SS-25" ICBM munition was dropped on Melbourne?

It also then overlays that with estimated population density in the areas covered by the various zones, and estimates immediate fatalities, and injuries. For explosions of either sufficient size, or proximity to the ground to kick up fallout (high air-busts hit harder, and wider, but don't kick up as much fallout, it's inefficient to do so, apparently), NukeMaps will also plot prevailing winds and density of fallout.

What if the currently deployed 800kt Russian "Topol SS-25" ICBM munition was detonated in downtown Melbourne?

You can pick your location, and from a variety of historically documented devices, from the North Korean tests, Pakistani and Indianweapons, the Trinity and WW2 bombs, all the way up through the Cold War era tests and production weapons, from estimated improvised terrorist weapons to the state-irradiating Tsar Bomba weapon.

Its a very sobering tool to visualize both the destructive capacity we have been capable of for the past 80 years, but also as a reminder of how fortunate we are to have only ever had these forces brought to bare in anger only twice.

Events: Trinity Day

"Trinity Test Fireball 16ms" by Berlyn Brixner

From Wikipedia

Trinity was the code name of the first detonation of a nuclear weapon, conducted by the United States Army on July 16, 1945, as part of the Manhattan Project. The White Sands Proving Ground, where the test was conducted, was in the Jornada del Muerto desert about 35 miles (56 km) southeast of Socorro, New Mexico, on the Alamogordo Bombing and Gunnery Range.


This test, which was found to have a yield of 20 kilotons

"Trinity-ground-zero-men-in-crater". 

ushered the world into the era of atomic weapons. Just 4 weeks later on August 6 1945 the first atomic weapon, Little Boy was used on Hiroshima .

 The people who developed the bomb, and tested it, people like Oppenheimer , Fermi and Feynmen took bets on what the outcome of the test would be, in terms of the expected yield, with bets ranging from 0 to 45kt.

Fermi took it a step further and offered to take bets among the scientists and military present as to if the atmosphere would ignite, and if so whether it would destroy just the state, or incinerate the entire planet.

Oppenheimer was reminded of the Bhagavad Gita; quote 'Now I am become Death, the destroyer of worlds.'. George Kistiakowsky is reported to have said "Oppie, you owe me ten dollars" .

For the first time, humanity was wielding the power of the stars, and producing weapons that were capable of effecting mass destruction on a strategic, geological and generational scale.

The Trinity tests marked the beginning of the era of nuclear warfare, which thankfully we've only ever ventured into in fiction and strategic documentation. And Preppers ....

Home Front: Alternate dwellings

I have always fantasied  about building or repurposing my own bunker. So much so that we have "you're allowed in the bunker" conversations with guests.

Obviously we don't have any ex-missile silos to convert into a SiloHome or the like, which would be most awesome; secure, rugged, self contained to a large extent and usually significantly removed from built up areas.  Perhaps still listed as a strike-site, so that's a drawback...

Then there is the thought about what kind of every-day structures would actually provide protection from a radiological/nuclear  attack as postulated on Gizmodo in their Where to hide in case of nuclear attack article, which is the kind of thing I am always interested in reading.   I can't think of a single house I've lived in, or visited that has a cellar in Australia. They just don't do that here, which is silly, considering the heat in summer ...

Then there is the concept of living inside the box which I've been keen on for decades, having seen shipping containers being both discarded and re-purposed.  I think it would be most excellent to build a home from these. Research has suggested however that they don't bury well. Which leads me to think of a complex castle like arrangement of many stacked and interconnected units. There are even online resources for floorplan suggestions.  

Dreams and hand-waving plans only, at this stage. I'm a long way off being able to do anything like this, but its a fun mental exercise.

Review: Excel Physics - APOC mini radiation detector

I'm a scientist by training and inclination, if no longer by profession. I love measuring things. My phone has all manner of measuring and mapping apps.

When I saw on Kickstarter that a pocket-sized radiation detector was coming up, I was thrilled. Following on from the 2011 Tōhoku earthquake and tsunami,
and subsequent Fukushima Daiichi nuclear disaster, it seemed that having my own gamma and high energy x-ray detector would be a great addition to my burgeoning toolkit.

The APOC Mini Radiation Detector Kickstarter fit that bill perfectly. The people of Excel-Physics put together a very compact, and easy to use package, which they offered in kit, or "built" forms. Being  pretty much devoid of electronics experience, I opted for the "built" kit.

When it arrived, I was delighted to find a very robust package, with a couple of connector cable, and a bridge component (which came in handy, as I needed to add it to make the device iPhone compatible.)

The clear plexi-case allows you to see right into the device, the circuit-board, wiring, batter pack, speaker and LED indicators, along with the copper-foil covered detector.

It features both a human readable LED/ speaker setup, with blinks and a "click" for each measured event, as well as a "data" setting that feeds to a device via a 3.5mm mic jack.

A simple Off/On/Data switch lets you change between settings, and on the other side, the data-port for the data cable. Access to in innards ( to change the 9V battery, or to adjust the sensitivity, if needed, is by unscrewing four little screws.

A cut-away on the bottom (in classic radiation trefoil format) gives a nice accent to the detector array.

I connect my detector up to my iPhone, using several apps, (Spectrogram and iOS7 Voice Memos) to track the "clicks", although I am waiting on a purpose built app to be put out by Excel Physics ...

Primarily a gamma and x-ray detector, it will also detect alpha particles (such as found in household smoke detectors) but can pick up interference from Bluetooth devices, according to Excel Physics. The old brick building I work on gives me more background clicks than the even older weatherboard I live in, as expected.

I have used this at home, and been pleased to see the LED flash every minute and a half, or so with its characteristic "click", but wanted to give it a real test, so took the whole lot into work, and visited the Diagnostic Imaging / Radiology department, and spoke to my pals in the "hot lab". They were bemused at the idea I had my own personal radiation detector, so were happy to point me at some "sources" to scan.





So, as you can see, I had a lot of fun with it. Between the rather rapidly decaying medical radionuclides and the strong but slow long half life Cs137 we got some great signals. I'm still trying to work out the best way to record and display the signals I get, but at least I have a portable, cheep to run detector for all my Mad Max water testing needs!