Garside and her partner Chris Whittingham recorded the album after an extensive sailing excursion spanning the Galápagos and Marquesas Islands, New Zealand, Australia, Mauritius, South Africa, and the Azores.^[6] According to Garside, "We recorded a lot of this through improvisation. Chris would come up with a drum loop and a riff. We would just play against the drum loop and record for an hour or hour-and-a-half... Then Chris did a little bit of chopping around. There were a couple of little fixes, but it was all there. I take a sense of happiness from that because there's always the raw real that comes out in the initial writing. That's so hard to recapture when you've known the song, and you've rehearsed it a hundred times, and you're taking it into the studio for the fifth time."^[2]

The album was released by One Little Independent Records on 20 April 2020, as a double vinyl/CD combination pack with additional handmade artwork including two signed framable prints, a pressed flower in glassine, and a comic art book, limited to 500 sets.^[1] On 1 May 2020, the album was made available for digital download and streaming on various platforms.^[1] On 28 April 2020, it was included in a playlist for All Songs Considered by Bob Boilen on NPR.^[7]

A standard edition double vinyl LP was released on 8 July 2020.^[8]

Brett Callwood of LA Weekly named it the album of the week on 12 May 2020, writing: "These 12 songs are a full journey. Wistful, delicate thoughtfulness gives way to pain, and then turns full circle again. You hear elements of Kate Bush, then Portishead then Björk. It’s like we’ve been allowed in Garside’s head for a good rummage through her psyche for a while."^[5] Jedd Beaudoin of PopMatters praised the album, writing that it "sounds unlike any other record you'll hear this year. Though even veteran artists offer occasional clues to their influences, crumbs of what lies at the center of their musical DNA, this is something that seems to have appeared virtually from nowhere, unaffected by contemporary sounds or concerns and yet entirely of them."^[2]

Chris Ball of the music review site Echoes and Dust called the album " a work of revelation, purge and covenant...  You may find it’s the noisy tracks that reel you in at first but the quality of the folkier numbers won’t take long to become apparent."^[10] The independent entertainment website Total Ntertainment described the album as "Stylistically varied, [ranging] from raw, bewildering, venomous rock to gentle folk musings."^[3] The Scotsman's Fiona Shepard wrote: "With characteristic disregard for the zeitgeist, Garside and her guitarist partner Chris Whittingham emerge from long-term self-imposed isolation on their sailboat home just as the rest of the world reckons with [COVID-19 pandemic] lockdown. But Geiger Counter suggests little has changed in Garside’s unhinged musical world. She is a woman of many voices from childlike gurgle to feral screech, which she unleashes on grungey tantrums and unsettling lullabies played on autoharp, with a diversion into the gothic vaudeville."^[11]

Writing for The Line of Best Fit, Tyler Kelly described the record: "Fleeting between honeyed infantile melodies, lascivious drawling, and guttural death rattles; Geiger Counter is a serpentine delirium dream conjured by Garside and Whittingham in their perpetual state of isolation whilst living out at sea."^[9]

• KatieJane Garside – vocals, autoharp, production
• Chris Whittingham – guitar, drums, percussion, production

• Geiger Counter at AllMusic
• Geiger Counter at Apple Music