Every Material Has a Radiation Fingerprint
Granite emits more radiation than most people realize. Potassium-40 is present in every human body. Brazil nuts are measurably radioactive because of radium uptake through deep root systems. Inherent — or naturally occurring — radioactivity is not a property exclusive to controlled nuclear materials. It's a baseline characteristic of physical matter, and in any research context where sensitive radiation detection is involved, knowing the inherent background of your specimens and materials is not optional.
The INHERENT RAD template handles this calculation at the record level. INPUT receives the material identifier and the relevant isotopic data — K-40 concentration in ppm, Th-232 activity, U-238 specific activity — in a structured format the RESULTS[INHERENT RAD] JS field can parse. The output is the computed inherent dose rate contribution from that material at a defined geometry and distance.
Where the Two-Field Design Pays Off
The minimal architecture of INHERENT RAD is a deliberate choice for a workflow where speed matters more than comprehensiveness. In field geology or environmental surveying, you're characterizing samples on-site or immediately after collection. You need the inherent background estimate for each specimen before you can interpret any anomalous readings on top of it.
The INPUT field carries the isotopic characterization data — typically pulled from XRF or gamma spectrometry output — formatted as a consistently delimited string. The RESULTS JS field computes the inherent specific activity in Bq/kg and the effective dose rate contribution at one meter, returning both with the isotope-specific weighting factors applied. That output is what you compare against your detector's anomalous reading to determine whether you're seeing true contamination or expected geological variation.
The single-record speed of this workflow — paste, compute, read, log — is what makes it viable in a field context. A researcher working through forty mineral specimens in an afternoon can characterize each in under a minute.
A Reference Library of Inherent Radiation Values
At 60 entries, the INHERENT RAD database is a materials reference for your lab's specific specimen inventory. Filter by material type within the INPUT string and you have the inherent radiation characterization for every granite sample, every ore specimen, every soil batch you've characterized. That reference is what your instrument's background correction is drawn from.
At 200 entries spanning multiple field campaigns, the database becomes a geospatial reference. If your INPUT strings include site location codes, you can cross-reference inherent activity against geography. Anomalous readings at a new site can be quickly checked against the inherent baseline from similar geological formations you've previously characterized.
The RESULTS field's computed dose rate output — consistently formatted across every entry — is what makes the aggregate analysis clean. You're not normalizing between entries that used different units or different distance assumptions. The JS field enforces the standard.