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    12 Discussions

    190-60 = 130 CPM ave.

    You have done a great great Job explaining the semiconductors besides using other types of solid state tubes. How much would this cost. I do experiments with clover and Thorium and it a gamma emitter (pretty high).

    So I bought this to read up to 65,000 CPM!!! The meter was 160 dollars CAN.

    https://www.ebay.ca/itm/GMC-300E-Plus-Digital-Geiger-Counter-Nulcear-Radiation-Detector-Meter-Beta-Gamma/291766729887?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

    Nice!!! I LOVE the use of silicon detectors, I fact I've actually been doing some research of my own. One technique I've found that helped reduce noise involves using a 4-5 second delay circuit with a peak detector and comparator to help auto calibrate it against noise from RF waves as well as small light leaks. Keep exploring!

    1 reply

    Oh yeah, I also spotted a little bit of disinformation though. In the Instructable you stated that the detectors undergo "performance degradation" from high radiation fields which is simply not true. It should be noted that only electronics using EEPROM and other low capacitance devices are majorly affected by radiation (this is due to ionizing radiation causing ionization and thus conduction in the silicon dioxide insulating layer). Other than that the radiation has basically no effects on electronics.

    This is really great I would love try it out.Good job.

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    kvital

    2 years ago

    One part of article is about one project, other one about other project. Tell me how photodiode that can detect only visible light will see gamma?

    1 reply

    all silicon semiconductors are sensitive to radiation, and in this case you have an unshielded diode already intended for sensing, which if you reverse bias the diode and shield it from visible light, you can register the hits from beta and gamma (alpha rarely can penetrate even thin fabric shielding) radiation by amplifying the tiny signal you get and reading the output data with a microcontroller. depending on how you set it all up, you can even get a rough idea of the energy level of the particle that caused the hit.