This may be slightly outside the remit of this forum - but if Ross will permit.
I'm doing some clearing out. I've found a small pen-type 'Quartz Fibre Dosimeter'. It is 11cm long, black, 15mm dia at the 'eye' end, 13mm dia at the far end. It has a bright yellow clip to attach to any pocket. It has no letters/numbers anywhere. It is calibrated from 0 - 200 Roentgens (it still registers 20 R - so what's in the 2nd draw of the back bedroom cupboard I have no idea!).
I don't know whether the RAF gave it to me, or UKWMO (where I was their Met Man for several years), but it is a Cold War artifact. If anybody wants it to use in any display, etc, they are welcome.
HTH
Peter Davies