For those needing portability, Rad Pro for Desktop works with Windows 8.1/10 tablets. Will not work with Surface tablets running Windows RT. Click This Link for Rad Pro Calculator Desktop Revision History List Version 3.26 (5/24/2009) New Install Package (8-26-2006) For Pocket PCs and Smartphones.
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The Center for Radiation Protection Knowledge provides downloadable models, data files, computer codes, and help files that provide ready access to data of interest in the radiation protection of workers and members of the public. This collection includes the models, elemental and radionuclide data, and supporting documentation necessary to describe the behavior of inhaled or ingested radionuclides.
- Version 2.70 of Rad Pro Calculator desktop has just been released. It is a major upgrade. Two new calculators were added that solve equations for minimum detectable activity (MDA), more recently termed minimum detectable concentration or minimum detectable contamination (MDC).
- Download Pro Calculator free download - Download App, PDF Download, Free Download Manager, and many more programs.
- Radiation radioactivity unit converter for make your calculation easier with BinaryTranslator.com. This converter provides conversion between units like becquerel.
- Rad Pro Calculator 2.0 See all Rad Pro Calculator performs many nuclear calculations that are useful to the health physicist, radiological researcher, radiochemist, radiation safety officer, health physics technician (HP) and other professionals in radiation physics and radiological engineering.
Please refer any technical questions about the models, databases, or documentation to Dr. Keith Eckerman.
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Downloads
Rad Toolbox v. 3.0.0 (5/1/2014)
This toolbox provides ready access to data of interest in radiation protection of workers and members of the public. This package was developed for the U.S. Nuclear Regulatory Commission and is documented in ORNL/TM-2004/27. The software runs on a PC under Windows 98/NT/2000/XP to provide access to the data through a single GUI. The data include dose coefficients for intakes of radionuclides, exposure to radionuclides distributed in the environment, and for exposures to photon and neutron radiation fields. Other supportive data include interaction coefficients for alpha, electron, photon and neutron radiations, nuclear decay data, biological and physiological data, and supplemental information on various topics. The ORNL TM report is included in the download. During the installation elect to ignore any messages regarding file updates. The NRC Rad Toolbox Web page is located at: http://www.nrc.gov/about-nrc/regulatory/research/radiological-toolbox.html.
Download Rad Toolbox: RadToolbox3_Setup.zip (26,850,924 bytes)
DCAL System v. 8.4 (11/1/2006)
DCAL is a comprehensive software system for the calculation of tissue dose and subsequent health risk from intakes of radionuclides or exposure to radionuclides present in environmental media. DCAL was developed for the U.S. Environmental Protection Agency and is documented in ORNL/TM-2001/190. The software runs on a PC under Windows 98/NT/2000/XP. The system includes extensive libraries of biokinetic and dosimetric data and models representing the current state of the art. DCAL maybe used either in an interactive mode or in a batch mode and is intended for experienced users with knowledge of computational dosimetry.
Download DCAL System: DCAL01_setup.zip (7,393,436 bytes)
ICRP38 v. 1.0 (3/25/2003)

This package installs the nuclear decay data of ICRP Publication 38 and the three Windows-based codes. The code WinChain assembles the decay chain and provides guidance regarding the truncation of the chain. RadSum provide a brief summary of the emitted radiation for the user supplied radionuclides. The DexRax utility extracts from the master files, the decay data for user specified radionuclides.
Download ICRP38: setup38.zip (2,490,268 bytes)
WinAct v. 1.0 (8/25/2002)
This package is the ORNL numerical solver (Windows version) for the coupled set of differential equations describing the kinetics of a radionuclide in the body. Several example input files are provided as a guide in using the package.
Download WinAct: setup_act.zip (436,267 bytes)
FGR13CD v. 2.1.13 (3/18/2002)
This is a viewer of the risk coefficients tabulated in Federal Guidance Report 13 and the age-specific dose coefficients calculated during the course of preparing Report 13. This is the current version (Ver 2.1) of the viewer software.
Download FGR13CD: fgr13_dbsetup.zip (19,886,152 bytes)
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BioMod v. 1.0 (6/29/2000)
This is a Windows help file detailing the age-specific biokinetic models and elemental data used in the calculations of the risk coefficients of Federal Guidance Report 13.
Download BioMod: setup_bio.zip (383,040 bytes)
DCFPAK v. 1.0 (3/29/2000)
The dose coefficient files and source code (FORTRAN) illustrating how to use the use the data files within an assessment code. This package is documented in ORNL/TM-13347. The dose coefficients for inhalation and ingestion intakes are those of ICRP Publication 30. The coefficients for external irradiation are from FGR-12. The download module, setup_DCF will install the files, source code, and executable. The code is a console application and hence runs under either DOS on Windows.
Download DCFPAK: setup_dcf.zip (1,018,070 bytes)
DFACTS v. 1.0 (11/18/1994)
These MS-DOS codes look up the dose coefficient from intakes of radionuclides from Federal Guidance Report 11 (ICRP Publication 30) and those for external exposure are from Federal Guidance Report 12.
Download DFACTS: setup_df.zip (896,835 bytes)

Rad Pro Decay Calculator
Category: Radiation Basics — Photons
Rad Pro Calculator Online
The following question was answered by an expert in the appropriate field:
Rad Pro Calculator results of exposure rate for a given activity of cesium-137 (137Cs) in units of milliroentgen per hour (mR h-1) and microsievert per hour (µSv h-1) are not a simple factor of 100. For example the dose rate at 50 centimeters (cm) due to 50 millicurie (mCi) of 137Cs is 182.8 mR h-1. But the output in µSv h-1 is 129.8 µSv h-1 and not the expected 1828 µSv h-1. Why is this so?
I must first note that the numbers you cite for the Rad Pro Calculator results do not seem to agree with those I obtain when I use the Rad Pro Calculator 'Gamma-Emitter Point Source Dose Rate' at this link. For the assumed 50 mCi point source at 50 cm from the dose point I obtain a result of 564.9 µSv h-1, substantially different from your value of 129.8 µSv h-1. When I specify units of mR h-1 I obtain 64.4 mR h-1, appreciably different from your value of 182.8 mR h-1. I cannot further address the values that you generated, although I suspect you might have inadvertently used different input value(s) from those that you cite.
At any rate, in order to convert dose equivalent rate units of µSv h-1 (which apply to tissue) to exposure rate units of mR h-1 (which apply to air), the multiplying factor is not 100 (or 10 as you seemed to use to get the 1828 µSv h-1 value from the 182.8 mR h-1). First, if we multiply the µSv h-1 value by 100 microrem (µrem) µSv-1 we should obtain units of µrem h-1; these units represent the quantity of equivalent dose rate to a small volume of tissue at the dose point. Keeping in mind that the equivalent dose rate is obtained by multiplying the absorbed dose rate in tissue by the appropriate radiation-weighting factor (1.0 for gamma radiation), we can assume that the equivalent dose rate in this case is equal in magnitude to the absorbed dose rate in soft tissue at the same point. Assuming that secondary charged-particle equilibrium exists at the dose point, which is an implicit assumption in the generation of gamma dose-conversion factors, the absorbed dose rate in tissue can be converted to absorbed dose rate in air by multiplying the tissue dose rate by the ratio of the mass energy absorption coefficient in air to soft tissue, (µ/ρ)en,air/(µ/ρ)en,tissue (for 137Cs photons this ratio is equal to about 0.91); the exposure rate may then be obtained by using an exposure-to-dose conversion factor of 8.76 mGy R-1 (or 0.876 rad R-1 in non-SI units).
If we then take the value that I obtained from the Rad Pro Calculator of 564.9 µSv h-1 we can convert it to units of mR h-1 as follows:
(564.9 µSv h-1)(100 µrem µSv-1) (1 µrad µrem-1)(1 rad/1,000,000 µrads)(0.91)(1 R/0.876 rad)(1,000 mR R-1) = 58.7 mR h-1
The value of 64.4 mR h-1 that Rad Pro Calculator yielded I believe results from the likelihood that the programmer assumed that the ratio of mass energy absorption coefficients (air to tissue) was 1.0, a simplification that is often suitable for reasonable approximations, although it can lead to more significant distortions, especially for low-energy photons.
George Chabot, PhD