# Discrepancy in Photon Heating Values **URL:** \ **Category:** User Support\ **Created:** [September 25, 2025, 6:26pm UTC](https://openmc.discourse.group/t/discrepancy-in-photon-heating-values/6019 "2025-09-25T18:26:07Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![yrrepy](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/yrrepy/32/2365_2.png) [@yrrepy](https://openmc.discourse.group/u/yrrepy)\ **Post date:** [September 25, 2025, 10:27pm UTC](https://openmc.discourse.group/t/discrepancy-in-photon-heating-values/6019/2 "2025-09-25T22:27:39Z")
There are no charged particles in OpenMC, it is all photon and neutron Kerma. I never use heating-local, I believe it pertains to lumping the secondary photons from fission into the Kerma. Though the wording/documentations is a bit fuzzy and implies all photon secondaries. #3 is the correct way. It’s to do with how OpenMC accounts for different interactions. This is a frequent hang-up in OpenMC > [@Photon heating](https://openmc.discourse.group/t/photon-heating/619/): > > Hi, I’m interested in studying heating in a reactor core. I ran my model in dev version (0.12.0) twice, with two different commits: A. From Jan 17 - after the correction of delayed gamma energy ([#1449](https://github.com/openmc-dev/openmc/pull/1449)). B. From Feb 4 - after the correction of photon energy, including separation into photon/electron/positron ([#1462](https://github.com/openmc-dev/openmc/pull/1462)). See tallies below. My questions are: In Case B (Feb 4) I observe negative positron energy, why is that? While neutron heating are same in both cases, when I compare heati… > [@Absorbed dose rate discrepancy between OpenMC & TRIPOLI](https://openmc.discourse.group/t/absorbed-dose-rate-discrepancy-between-openmc-tripoli/4057): > > Hi, I am trying to compare the absorbed dose rate on a cylinder due to a punctual source with both neutron and photon emissions between 3 Monte-Carlo codes: TRIPOLI-4, RayXpert and OpenMC. Both TRIPOLI-4 and RayXpert gives the same results (around 10% discrepancy, mostly due to some simplification in the TRIPOLI modelling). However, my OpemnMC input should be identical to the TRIPOLI one but I have a discrepancy factor of 10 000. Here are the results: Here is my python script for … --- _[View the full topic](https://openmc.discourse.group/t/discrepancy-in-photon-heating-values/6019)._