[en] 1 - Description of program or function: PUTZ calculates dose rates from three-dimensional photon sources in a three-dimensional system. The code allows the specification of the source and body geometries as simple parallelepipeds and annular parallelepipeds (tanks) and permits the inclusion of multiple sources and multiple detectors in a single case. The shielding bodies may consist of up to 6 materials. 2 - Method of solution: The point-kernel method employs the Geometric-Progression (GP) formula for the buildup factor. The GP coefficients and attenuation coefficients, taken from the ANSI/ANS-6.4.3-1991 compilation, are read from a data file. An optional multi-material (composite) buildup factor formula may be used. The FIDO input system is used which allows easy entering or modifying the various input arrays. 3 - Restrictions on the complexity of the problem: Photon source energies are limited to values between 15 keV and 15 MeV. A total of 6 shielding materials can be treated. All bodies are solid parallelepipeds or parallelepiped shells (tanks)