Counter for low-level alpha radiation used at the British Museum Department of Scientific Research for measuring the radiation level of surrounding soil when calculating thermoluminescence dates of samples, estimated date 1970-1979, comprising counter unit probably by the Littlemore Scientific Engineering Co., plus a Brandenberg model 2475R photomultiplier power supply mounted in one housing, and a photomultiplier tube unit. Counter for low-level alpha radiation used at the British Museum Department of Scientific Research 1970-1979 (estimated)