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The first dosimeter that measures gamma and beta radiation separately (gamma in uSv/h, beta in counts/min*cm2). It uses two Geiger counters - one for gamma, one for beta rays - and anti-coincidence system to avoid double counts caused by one gamma quantum affecting both counters. Sensitivity is very good, RD1008 detects even wery soft radiation, for example, of crystal glass, granite stones, potassium compounds and uranium glass with low content of uranium. The drawback is a bit too small range for beta rays - only 999 counts/min of square centimeter, so it could get overload even by thorium gas mantle. That range could be bigger, but closing the shutter can extend beta-measurement range twice. Device works in two modes - "measurement" is slower, but more accurate and measures both types of radiation separately in units proper for them, "search" mode is quicker, but measures all radiation without distinction in uSv/h. RD1008 has option of radiation background subtraction, so we can measure "pure" radiation of our source. First we have to measure background in radiation-safe place, the result is saved in memory of dosimeter and then just switch on option "background subtraction" - we will see "pure" result with separate value of background. RD1008 counts also all absorbed dose and we can perform two independents counts - when counting "dose1", the "dose2" register is not active and vice versa. So we can measure, for example, our total absorbed radiation and additionally, radiation absorbed by short time in Chernobyl or plane flight. Dosimeter uses one AA battery as power source and is extremely energy saving - one fresh battery lasts for 950 hours when using dosimeter on factory settings (without sound and total dose counting). RD1008 has few drawbacks - it's delicate, has to be handled carefully because grate protecting window of counter is not very thick and can be broken by strong hands.Unfortunately, the measurement is restarted every time we leave main menu - thats second drawback. And theres no protetive case for dosimeter provided by producer. For such an expensive device it should be included. But despite those minor disadvantages I can strongly recommend that Geiger counter and I would say, that it's a Cadillac of dosimeters. RD1008 is worth it's price and will be best choice both for experienced and beginning "Home Dosimetrists" Read full review
Verified purchase: Yes | Condition: Pre-owned