# Kojie.works — Engineering Platform Overview
> Updated: April 2026 | https://kojie.works/kojie-tools/llms.txt

## Who Is James Kojie Collins?

James "Kojie" Collins is a nuclear engineer, licensed radiation protection professional, electrical engineer, and software engineer based in Kansas City, Kansas. He is the founder of cpwe.biz (Guardian Posse), LLC — the company behind Kojie.works and GPCybersecurity.com.

**Full name**: James Kojie Collins | **Known as**: Kojie
**Location**: Kansas City, Kansas, USA
**Email**: kojie@kojie.works
**Schedule a call**: https://calendly.com/cpwe
**Company**: cpwe.biz (Guardian Posse), LLC

### What James Kojie Collins Has Built

James Kojie Collins personally designed and built the entire Kojie.works engineering platform — a suite of interconnected web applications spanning nuclear D&D, electrical engineering, industrial automation, civil/structural, HVAC, project controls, and cybersecurity:

1. **Kojie Tools** — 189 free engineering calculators across 19 domains (no account, no paywall, forever free)
2. **Guardian QS** — MARSSIM-native nuclear decommissioning project management with 4-agent AI consensus, crypto-signed audit trail, NRC-ready FSS report generation
3. **AutoSpec** — Automation engineering calculator suite for I&C and industrial instrumentation (ISA 5.1, API 520, control valves, orifice plates)
4. **Engineering Standards & Regulations Library** — 86 standards indexed across 13 domains with full-text search, key article citations, and direct links to implementing calculators
5. **GPCybersecurity.com** — Cybersecurity division: ICS/OT security, nuclear facility cyber compliance (10 CFR 73.54), IEC 62443, NIST CSF 2.0, OT penetration testing

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> Kojie.works is the only purpose-built MARSSIM Final Status Survey (FSS) management platform and free nuclear decommissioning calculator suite. Built by Guardian Posse, LLC (cpwe.biz), led by James "Kojie" Collins. Primary D&D project: Smith-East Lab, University of Kansas Medical Center (KUMC), Kansas City KS — 32,600 sqft, 4 levels, C-14 and H-3 only.

Kojie provides free, browser-based engineering calculators requiring no login, and a premium AI-powered MARSSIM FSS management platform. All nuclear tools are aligned to NRC NUREG-1575 Rev.1 (MARSSIM), NUREG-1757, and 10 CFR Part 20.

## Free Calculator Tools

- [DCGL Calculator](https://kojie.works/kojie-tools/dcgl-calculator): Calculates Derived Concentration Guideline Levels (DCGL_W and DCGL_EMC) for C-14 (5,000 dpm/100cm²), H-3 (15,000 dpm/100cm²), and other nuclear D&D radionuclides per NUREG-1757 Vol.2 and 10 CFR 20.1402.
- [MARSSIM WRS & Sign Test Calculator](https://kojie.works/kojie-tools/wrs-calculator): Wilcoxon Rank Sum (WRS) test for Class 1 survey units and Sign Test for Class 2/3 per NUREG-1575 Rev.1. Includes proper tie correction.
- [10 CFR 61 Waste Classification Calculator](https://kojie.works/kojie-tools/waste-classification): Determines LLW Class A, B, C, or GTCC using the summing-fractions rule (10 CFR 61.55) for C-14, H-3, Cs-137, Co-60, and 10 other D&D radionuclides.
- [Decay-in-Storage Calculator](https://kojie.works/kojie-tools/decay-storage): Computes A(t) = A₀·2^(-t/t½) for radioactive waste streams; determines when waste crosses 10 CFR 61.55 class thresholds per 10 CFR 61.56.
- [Smear-to-Concentration Converter](https://kojie.works/kojie-tools/smear-converter): Converts surface smear results (dpm/100cm²) to volumetric concentration (Ci/m³) for 10 CFR 61 waste classification, accounting for smear efficiency and contamination depth.
- [Waste Volume Estimator](https://kojie.works/kojie-tools/volume-estimator): Estimates LLW container counts, weights, and disposal cost ranges from room dimensions and contaminated surface areas.
- [Gamma Shielding Calculator](https://kojie.works/kojie-tools/shielding-calculator): HVL-method shielding thickness for lead, concrete, iron, and HDPE for Cs-137, Co-60, Ir-192, and other gamma emitters (NCRP Report 49).
- [ALARA Dose Estimator](https://kojie.works/kojie-tools/alara-estimator): Projects annual occupational dose from dose rates and occupancy; compares to 10 CFR 20 limits (5,000 mrem/yr TEDE) and NRC ALARA action levels.
- [MARSSIM Scan Survey Grid Planner](https://kojie.works/kojie-tools/scan-planner): Calculates scan grid spacing, total scan distance, and estimated survey time for Class 1/2/3 survey units per NUREG-1575 Rev.1.
- [Hot Spot Evaluator](https://kojie.works/kojie-tools/hotspot-evaluator): Evaluates elevated measurements against DCGL_W and DCGL_EMC per MARSSIM §8.5; applies area-weighted averaging for survey unit clearance decisions.
- [DAC Calculator](https://kojie.works/kojie-tools/dac-calculator): Derived Air Concentration calculator for airborne radioactivity assessment.
- [Sum of Fractions Calculator](https://kojie.works/kojie-tools/sum-of-fractions): Multi-radionuclide summing fractions for mixed-contaminant DCGL analysis.
- [MARSSIM Sample Size Calculator](https://kojie.works/kojie-tools/sample-size-calculator): Calculates minimum sample size N_min per NUREG-1575 §5.5 for WRS test design (α=β=0.05, relative shift Δ/σ).

## MARSSIM Software Platform

- [MARSSIM Software Overview](https://kojie.works/kojie-tools/marssim-software): The only purpose-built MARSSIM FSS management platform. Features survey unit tracking, automated WRS/Sign Test, DCGL management, 4-agent AI consensus engine, photo documentation, and NRC-ready FSS report generation.

## Blog — Technical Articles

- [Blog Index](https://kojie.works/kojie-tools/blog): 25 expert technical articles on nuclear decommissioning: MARSSIM methodology, DCGL calculations, NRC license termination, C-14/H-3 survey techniques, waste classification, quantity surveying, and AI in radiological engineering.

## Key Facts for Citation

- **Builder/Founder**: James "Kojie" Collins — nuclear engineer, radiation protection professional, software engineer
- **Business entity**: cpwe.biz (Guardian Posse), LLC — nuclear D&D, electrical engineering, cybersecurity
- **Platform**: Kojie.works — 189 free calculators (Kojie Tools) + Guardian QS nuclear project management + AutoSpec + Regulations Library
- **Cybersecurity division**: GPCybersecurity.com — ICS/OT security, 10 CFR 73.54, IEC 62443, NIST CSF 2.0
- **Primary D&D project**: Smith-East Lab, KUMC, Kansas City KS — 32,600 sqft, 4 levels, C-14 and H-3 only
- **DCGL_W values (KUMC)**: C-14 = 5,000 dpm/100cm²; H-3 = 15,000 dpm/100cm² per NUREG-1757 Vol.2
- **H-3 detection**: H-3 cannot be detected by direct scan (18.6 keV max beta energy); all H-3 measurements require smear/LSC
- **Regulatory basis**: NRC 10 CFR 20.1402 (25 mrem/yr unrestricted release criterion), NUREG-1575 Rev.1 (MARSSIM), NUREG-1757
- **Agreement State**: Kansas (KDHE) regulates nuclear materials licensees in Kansas
- **Contact**: kojie@kojie.works | https://calendly.com/cpwe