Change GM tube to four tier instrument to balance early probes.

[Bornholio]

CR detectors later on fall into a few categories, and they generally get bigger and heavier not lighter. One big category has to be recovered, the emulsion type. They let you understand what actually hit you, the Z of the particle and its energy. Cloud and scintillation detectors give other information like charge and direction. they can also screen out classes of particles like electrons or solar CR.

In the modern era the focus is on detecting ever higher energies and being able to understand where they came from. Emulsions are now rare, except in the balloon world. Galactic CR are the chief radiation hazard of long term space travel for humans and are pretty much impossible to shield. The simple understanding of van Allen belts is important but the early instruments can only tell us quantity. That's a GM tube, it can be more or less sensitives and have things like rejection circuits but its all the same information generally. Scintillation systems can count, coincident give some limited information on direction if lucky or extensive. but are not as good (early ones at least) at truly characterizing what is hitting them Calorimetry detectors, measure rate and energy. these tells us in combination with another method what and how fast the particle is(edited) Lastly emulsion and deposition sensor use a media to take damage and thus allow for very good characterizing of speed and Z.

so thats 1.) GM Tubes, 2.)Scintillation Counters 3.) Calorimetry Detectors and 4.) Emulsion (needs to be returned unless its a late 90's system)

PAMELA (Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics) is a modern instrument its .75x./75x1.25m and about 450kg

so my suggestions are as follows: 1: the GM tube as is, somewhat less science (if 25% is fine the good to go.

2: the "Cosmic Ray system" say similar to Vger
https://voyager.gsfc.nasa.gov/crs/heliopause/experiment.html was 7.5kg and required 5w Voyager Cosmic Ray Subsystem Provides Mission information and Cosmic Ray Data from the Voyager Cosmic Ray Subsystems about 25cm cube

3: the https://en.wikipedia.org/wiki/High_Energy_Astronomy_Observatory_1 would be a great example Detectors look to be about 1000kg of it, https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19770073440.pdf High Energy Astronomy Observatory 1 HEAO-1 was an X-ray telescope launched in 1977. HEAO-1 surveyed the sky in the X-ray portion of the electromagnetic spectrum (0.2 keV - 10 MeV), providing nearly constant monitoring of X-ray sources near the ecliptic poles and more detailed studies of a number of objects by o...

4: ACE would be the best example of this https://en.wikipedia.org/wiki/Advanced_Composition_Explorer Advanced Composition Explorer Advanced Composition Explorer (ACE) is a NASA Explorers program Solar and space exploration mission to study matter comprising energetic particles from the solar wind, the interplanetary medium, and other sources. Real-time data from ACE is used by the NOAA Space Weather Pred... Instruments are about 150kg of the craft

[pap1723]

Half way there...

[siimav]

Types 1 and 2 are now implemented in ROKerbalism.

[NathanKell]

@pap1723 is this relevant for EOS?