Big Collection WWII Aircraft Instrument Panels and Instruments confiscated

[Huub Vink]

As I don't have the same documents and I don't have all the limits for every nuclide in my head I can not confirm or deny that an activity of 74 kBq on a wristwatch is below the threshold above which a permit is required.

Radium is an alpha emitter. As the alphas are blocked by the glass of the instrument you can only measure the secondary radiation. It is therefore virtually impossible to calculate the real activity. But on several instruments I have measured a dose rate above 25 µSv/hr, while the exposure limit for non-radiation workers is 1 µSv/hr.

As it is very hard to translate Dutch legislation I will write you an e-mail to explain the legal context. (I still must have your e-mail address somewhere).

For the Americans there isn't a real problem. In the US an aviation instrument is considered a sealed unit, therefore the presence of radio-active material is not taken in account.

Regards,
Huub