## Abstract

The fraction of X- and gamma -ray photons that give rise to a K-edge escape photon of iodine as a function of photon energy is derived for a NaI(Tl) detector from published values in the literature and confirmed by experimental measurement for a 2*2 inch detector. These values are used to derive a matrix describing the K-edge escape of iodine for NaI(Tl) photon detectors. The fraction of Compton photons scattered into each lower energy channel as a function of incident photon energy is measured utilizing monoenergetic photon sources. From these measured values, a matrix is derived that described the effects of Compton scatter in the crystal as a function of incident photon energy. The matrix E_{kj}(E), describing K-edge escape photons, and the matrix, S_{kj}(E), describing Compton scatter, are combined to form the matrix C_{kj}(E), describing both escape and Compton scattered photons.

Original language | English (US) |
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Article number | 014 |

Pages (from-to) | 585-586 |

Number of pages | 2 |

Journal | Physics in Medicine and Biology |

Volume | 18 |

Issue number | 4 |

DOIs | |

State | Published - Dec 1 1973 |

## ASJC Scopus subject areas

- Radiological and Ultrasound Technology
- Radiology Nuclear Medicine and imaging