Eric Bogers
About the article

Improved Radiation Meter — Improved!

a hardware update for the alpha, beta and gamma counter

Improved Radiation Meter — Improved!
Back in 2011 Elektor published an ingenious radiation meter that worked without a special, expensive and difficult to obtain Geiger-Müller tube. Author Burkhard Kainka, no stranger to faithful Elektor readers, showed beyond refute that a simple photodiode with some additional electronics was enough to show radiation. A few months after 'Fukushima', it was a hot topic.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list

Components List


All 5%, 0.25W, 250V

R1 = 1MΩ

R2 = 1kΩ

R3,R14 = 10MΩ

R4 = 4.7kΩ

R5,R7 = 10kΩ

R6,R8 = 330kΩ

R9 = 470Ω

R10,R12 = 220Ω

R11 = 100Ω

R13 = 5.6Ω

P1 = 10kΩ trimpot, horizontal



C1,C2,C3,C9 = 100nF, 50V, X7R, 0.2’’ pitch

C4,C5 = 47pF, 50V, C0G/NP0, 0.1’’ pitch

C6,C7 = 100µF, 50V, 3.5mm pitch, 8x11mm

C8 = 10µF, 50V, 2mm pitch, 5x11mm



D1 = BPW34, straight

D2 = 1N4004

LED1 = 5mm diam.

T1 = BF256B

IC1 = ATMega88PA-PU (programmed, Elektor Store # 110538-41)

IC2 = LM358

IC3 = 78L05



Bz1 = piezo buzzer, 12mm, 1-3Vpp, 2.04kHz fres, 6.5mm

IC1 = IC socket, DIP-28 narrow

IC2 = IC socket, DIP-8

K1.K2 = 1x3 pinheader, straight, 0.1’’ pitch

K3 = 1x6 pinheader, straight, 0.1’’ pitch

K4 = 1x2 pinheader, straight, 0.1’’ pitch

K5 = 2x3 pinheader, straight, 0.1’’ pitch

K6 = 12V, 3A DC power connector, 1.95mm pin, (Lumberg NEB 21R)

LCD1 = LCD module, 2x16, Elektor Store # 120061-74 (+ 16-pin pinheader, straight, 0.1'' pitch)

Mounting material for LCD1

S1 = pushbutton, PCB mount, 6x6mm

S2 = slide switch, PCB mount, right angled, 0.1’’ pitch, (Würth Elektronik # 450302014072)

PCB no. 110538-1 v2.2

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