Dear Ali,

what do you mean?

X-ray tube having point like focus or a closed radioactive (point) emitter?

Please specify energy range and in what respect it should be the 'best'.

Dear Gerhard,

I need a closed radioactive point source which emite x-ray to check the energy calibration for Silicone detector.

Any energies in the range of x-ray spectrum can help to do that

Please have a look at the links:

http://www.ezag.com/fileadmin/ezag/user-uploads/isotopes/isotopes/Isotrak/isotrak-pdf/Product_literature/EZN/03_section03_point_and_tube_sources.pdf

and http://www.hanshin-eng.co.kr/index/img/5Nuclitec.pdf.

Please have a look at page B6 of the second link.

Thank you Gerhard

Dear Ali,

with respect to your remark 'which can be found in nuclear laboratory' you should think on natural uranium (metal sheet). It has a lot of lines between about 60keV and about 190keV. Most of then are gamma lines from daughter nuclides resulting from the decay but also U k-alpha and beta show up.

However it has a very low activity, but you can mount is directly in front of your detector. Measurement takes a while.

If appropriately mounted in a lead or tungsten shield the handling is very easy.

thank you again my dear Gerhard