Introduction
The document introduces the HORIBA PA-1000 "Radi" environmental radiation monitor, designed to measure environmental radiation, specifically gamma rays, using plant-based plastic materials. It aims to reduce petroleum consumption and offers easy measurement capabilities for non-specialists.

Specifications
The PA-1000 Radi is capable of measuring gamma rays starting from 0.001 µSv/h. It features a splash-resistant construction (IPX4), is compact and lightweight, and operates on two AA batteries with a life of 50 hours or more. The device uses a CsI (Tl) scintillator for high-performance detection and can measure radiation levels from normal to 100-200 times natural intensity.

Measurement Capabilities
The monitor displays radiation measurements in microsieverts per hour (µSv/h) on a large LCD. It includes an automatic power-off function after 3 hours and an audible beep when radiation is detected. The device is designed to measure radiation quantity at a location but does not assess safety.

Radiation Types and Units
The document explains the types of radiation: alpha rays (α), beta rays (β), and gamma rays (γ), with gamma rays being the most penetrating. It also describes radiation units: Becquerel (Bq) for radioactivity, Gray (Gy) for radioactive energy received, and Sievert (Sv) for the effect on humans.

Technical Specifications
The detection method is scintillation, measuring gamma rays with a minimum sensitivity of 1000 counts per minute for 1 µSv/h. The relative error of indication is ±10%, with a maximum coefficient of variation of 0.1. The energy range is more than 150 keV, with an effective measurement range of 0.001 - 9.999 µSv/h. The device dimensions are 68 (W) × 28 (D) × 121 (H) mm, weighing a maximum of 175 g without batteries. Accessories include an instruction manual, two AA batteries, and a neck strap.

Recommendations
The International Commission on Radiological Protection (ICRP) recommends a maximum exposure of 1 mSv per year to manmade radiation for the general public, excluding medical checkups.