We have used a variable x-ray source to calibrate the response of FPIX readout chips. The source was made by Amersham (code AMC.2084). The primary souce is a 10mCi americium-241 souce. This source illuminates one of six metal foils, which flouresce in the x-ray region, as shown in the table below:

Target | Energy (keV) | Photon Yield | |

Selected | K_alpha | K_beta | (#/sec/steradian) |

Cu | 8.04 | 8.91 | 2,500 |

Rb | 13.37 | 14.97 | 8,800 |

Mo | 17.44 | 19.63 | 24,000 |

Ag | 22.10 | 24.99 | 38,000 |

Ba | 32.06 | 36.55 | 46,000 |

Tb | 44.23 | 50.65 | 76,000 |

Click here for a much more complete listing of K and L x-ray emission lines

As a reminder, the K lines are transitions to N=1 & the L lines are transitions to N=2.

K_alpha is N=2 to N=1 (K_alpha1 is 2P3/2 to 1S1/2; K_alpha2 is 2P1/2 to 1S1/2).

K_beta is N=3 to N=1.

K_gamma is N=4 to N=1.

L_alpha is N=3 to N=2.

L_beta is N=4 to N=2.

L_gamma is N=5 to N=2.

FPIX front-end leakage current compensation

Last Updated on 11/4/99

By David Christian