Make your own
sounds good –
Another Great Kickstarter Project To Measure Japan Radiation
“We are going to manufacture and sell the Smart Radiation Detector connected with iPhone / iPod Touch / iPad via microphone input, at a low price less than fifty dollars by using cheap PIN Photo-diode instead of expensive Geiger-Muller Tube to detect beta and gamma radiation. The actual electronic circuit is so simply it fits inside a match box or a FRISK mint-box, without battery.”
DETAILS:
Our Kickstarter project launched
The Louisiana Sinkhole Bugle 
Well I for many will surely welcome your geiger but what is it able to do .?