---
title: "Model PM1703M (PRD) Gamma Personal Radiation Detector [Obsolete]"
date: 2024-12-19T08:40:25Z
modified: 2026-05-05T15:37:35Z
permalink: "https://www.berkeleynucleonics.com/model-pm1703m-prd/"
type: page
status: publish
excerpt: ""
wpid: 18885
---

  [ A 

####  When were neutrons discovered? 

 



 ](#) 

See this article: [https://www.berkeleynucleonics.com/december-3th-2020-history-neutron-detection](/december-3th-2020-history-neutron-detection)