Radioactive film lenses and Geiger counter Kit

The Super-Takumar 50mm f1:1.4 and Mighty Ohm Geiger kit
The yellowing of the lens caused by the radioactive decay.

Last week marked the ten year anniversary of the Japanese earthquake and resulting tsunami that caused the Fukushima Daiichi nuclear disaster.

In the years following that tragic event, flotsam began arriving on the Pacific West Coast. Volunteers making great effort to return personal items back to family and loved ones in Japan.

Models showed the ocean currents and their possible nuclear contamination as it crossed the Pacific Ocean.

My interest in sensors and environmental monitoring led me to the relatively inexpensive Mighty Ohm Geiger Counter kit. A fun open-source microcontroller-based Geiger counter kit you solder together yourself.

Years ago I began collecting vintage film cameras, still occasionally shooting and developing my own B&W film today. Ebay was a great source for these antique objects of optical and mechanical precision, which were practically given away in the early days of the digital camera’s rise. Some film cameras are still sought after for collectibility and some manual focus film lenses got a new life with the use of adapters on digital cameras.

While I had an interest in detecting any increased environmental radioactivity from the event as a citizen scientist, my main motivation was testing old film camera equipment.

One of my favourite Ebay film camera purchases that I still use today is the Asahi Pentax Spotmatic SP. I got it as a “kit” with a large assortment accessories and quality lenses. At nearly 60 years old, these Super-Takumar screw thread M42 mount lenses have such a precise feeling. The range of prime lenses in this purchase included:
Wide angle 28mm f3.5, Zoom 135mm f2, and Fast 50mm f1.4.

Small yet surprisingly hefty, the only way I can describe the focus dial is like the volume knob on an expensive stereo. Smooth resistance. The aperture dial clicks into each stop without wiggle. Lens covers are friction-fit without mechanical fasteners, hoods and cases, straps all immaculate condition and with such tight tolerances. I need a thesaurus for additional words for “precise”.

From this camera, and the 50mm f1:1.4 specifically, I created one of my personal favourite pictures of all time.

I have however heard stories of some lenses being radioactive and also that some cameras may have been looted from nuclear contaminated sites such as Chernobyl.
In the late ’90s my camera of choice was a lomo smena 8m. Used mainly backpacking, there is really no lighter fully manual 35mm camera.

There are plenty of forums, articles, and Youtube vids, listing/discussing radioactive lenses. Thoriated glass was used for it’s optical properties perhaps before the effects of prolonged exposure to radiation were fully understood. While many dismiss the risks associated with owning or using this radioactive equipment, I’ll leave it for the reader to make their own informed decisions.
A comical radiation dose chart from

I’ll admit, until I had a source of beta or gamma radiation, my geiger counter was essentially a really great random number generator. Blip… blip….blip. blip

My radiation detector is capable of detecting beta and gamma radiation but alpha radiation can not detected. A bit more reading about Thorium232 tells me that it actually decays emitting alpha radiation though.

Hang on, what’s going on?

Turns out the decay chain releases a “cascade” of fun alpha, beta, and gamma particles. The latter saturating the Geiger-Mueller tube sensor.

From the serial monitor getting close had the following readings:
CPS, 18, CPM, 1080, uSv/hr, 6.15, FAST

Though detectable only close to the source, it’s hard to read these kind of numbers and say I want to go out and hold this up to my face for half a day.

And keep it the house with my family for years to come? Nope. Topes lose, Topes lose.

I wouldn’t even consider selling this lens at this point, even to someone who fully acknowledges the risks. Because while they might accept it, the logistics people, delivery drivers, shippers or anyone in between didn’t agree to that.

Question is, where and how do you dispose of this hazardous, gorgeous, and “precise” material?

UPDATE: I’m now in touch with the Historic Artefact Recovery Program (HARP)
Operated by Canadian Nuclear Laboratories (CNL). The HARP
provides technical advice, assistance, identification and management of radioactive artefacts found on public and private
properties across Canada. Where necessary, the artefacts are transported to a licensed long-term storage facility located at
CNL’s Chalk River Laboratories in Chalk River, Ontario.

Generative Art Using Machine Learning

Yesterday OPENAI released a showcase of examples demonstrating image generation from text called DALL-E. The complexity of never seen examples is impressive. The quality of illustration and images makes you wonder where this will be used when anything you can think up, can be convincingly generated.

Sleepy Owl Illustrations are not SuperbOwl but not too bad.

Art, design, fashion, or possibly just to deceive? Still I’d love to see more categories or variations. Possibly an Open API


The examples are uncanny and familiar while still being “unique” or new. The low effort to produce many satisfactory results will be enough for many, especially if the cost is low.

It’s easy to point to jobs or industry that this could one day replace however I see more people working with machine learning. Human preference should steer results. A fleshy discriminator.

I joked that I’m now a Canadian fashion designer.

And just the day before another generative adversarial network, or GAN was shown called Taming transformers. This technique uses segmentation trained from landscape images to generate high resolution landscapes.

Generate van art

Cryptoart seems to be booming for well known generative artists at the moment and tools like these now eclipse some of the earliest GAN art sold at auction.

Previously other trained networks such as StyleGAN and BIGGAN peaked my interest in generating art with code. Neural networks for image generation have improved in leaps and bounds. Better UI to allow anyone to explore makes this really accessible and easy.

Exciting times.

“Big Flood” lightbox

Blue led animation in steel laser cut Coast Salish artwork

Using the Adafruit Adabox #017 I added leds and an e-ink display to a lasercut lightbox made of steel by Coast Salish artist Xwalacktun as a gift this year.

A miniature version of He-yay meymuy (Big Flood), it’s 30cm tall with an 11cm diameter. The original piece is an impressive 487.8cm tall by 167.6cm made of aluminum. Located at the entrance to the Audain Art Museum, it’s is a powerful piece inside a beautiful building.

I used a metre of RGB neopixels wrapped around a cardboard tube, diffused with the bubblewrap, and plugged into the Adafruit Magtag to animate rain. In this mode the lightbox will eventually fill to a full blue colour.

There are three other modes with different colours and animations using the Adafruit_led_animation library. Each mode animates differently and updates the e-ink display with a section of art from the lightbox.

Adafruit MagTag eink display
Top View: With e-ink the last image will remain, even after removing power.

I even upcycled the spool from the neopixel strip to mount the MagTag as it fit snuggly. There are plenty of other features I’ve yet to take advantage using built in Wi-fi, light sensor, etc.

Art by Coast Salish artist Xwalacktun
296 x 128 px Indexed Colour .BMP used to display on e-ink

The base is made with glued pieces of western red cedar to mimic the architecture of the museum and carved to receive the artwork.


Low angle sun illuminates Whistler Mountain

Whistler Mountain and crystallized snow from a walk today.

Adafruit MagTag

Just started playing with the Adafruit MagTag internet connected eink display.

Running CircuitPython, and using ESP 32-S2 to connect over wifi. It’s wild that the 4-shade B&W eink display stays even after power is removed.

Stemma connectors make adding sensors quick and easy. Live updating file and plenty of libraries / examples makes testing super-quick.

This greyscale eink explainer is great way to understand what’s going on.

The most difficult thing to this point is correctly double-clicking the reset button to update UF2

More to come…