The term proportional counter tube is identified in base64 scheme by the sequence cHJvcG9ydGlvbmFsIGNvdW50ZXIgdHViZQ==, while the MD5 signature is equal to 79b6106c5ecf035e923613514056c5b8. The ASCII encoding of proportional counter tube in hexadecimal notation is 70726f706f7274696f6e616c20636f756e7465722074756265.